[BKPATCH] Re: AUDIT of 2.5.15 copy_to/from_user

Arnaldo Carvalho de Melo
2002-05-19T05:13:22Z

Em Sat, May 18, 2002 at 07:55:35PM -0300, Arnaldo C. Melo escreveu:
> Heads up: I'm finishing a bk changeset for intermezzo, will be submitting
> to Linus in some minutes.

Here is, Linus, if you think its ok, please pull it from:

http://kernel-acme.bkbits.net:8080/intermezzo-copy_tofrom_user-2.5

- Arnaldo

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.540 -> 1.541
# fs/intermezzo/kml.c 1.1 -> 1.2
# fs/intermezzo/ext_attr.c 1.2 -> 1.3
# fs/intermezzo/psdev.c 1.7 -> 1.8
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/05/19 acme@conectiva.com.br 1.541
# fs/intermezzo/ext_attr.c
# fs/intermezzo/kml.c
# fs/intermezzo/psdev.c
#
# - fix copy_{to,from}_user error handling (thans to Rusty for pointing this out)
# --------------------------------------------
#
diff -Nru a/fs/intermezzo/ext_attr.c b/fs/intermezzo/ext_attr.c
--- a/fs/intermezzo/ext_attr.c Sun May 19 02:07:36 2002
+++ b/fs/intermezzo/ext_attr.c Sun May 19 02:07:36 2002
@@ -105,9 +105,8 @@
printk("InterMezzo: out of memory!!!\n");
return -ENOMEM;
}
- error = copy_from_user(buf, buffer, buffer_len);
- if (error)
- return error;
+ if (copy_from_user(buf, buffer, buffer_len))
+ return -EFAULT;
} else
buf = buffer;
} else
diff -Nru a/fs/intermezzo/kml.c b/fs/intermezzo/kml.c
--- a/fs/intermezzo/kml.c Sun May 19 02:07:36 2002
+++ b/fs/intermezzo/kml.c Sun May 19 02:07:36 2002
@@ -31,10 +31,9 @@

ENTRY;
/* allocate buffer & copy it to kernel space */
- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

if (input.reclen > kml_fsdata->kml_maxsize)
@@ -45,11 +44,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.volname, input.namelen);
- if ( error ) {
+ if (copy_from_user(path, input.volname, input.namelen)) {
PRESTO_FREE(path, input.namelen + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.namelen] = '\0';
fset = kml_getfset (path);
@@ -57,10 +55,9 @@

kml_fsdata = FSET_GET_KMLDATA(fset);
/* read the buf from user memory here */
- error = copy_from_user(kml_fsdata->kml_buf, input.recbuf, input.reclen);
- if ( error ) {
+ if (copy_from_user(kml_fsdata->kml_buf, input.recbuf, input.reclen)) {
EXIT;
- return error;
+ return -EFAULT;
}
kml_fsdata->kml_len = input.reclen;

@@ -94,21 +91,19 @@
struct presto_file_set *fset;

ENTRY;
- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
PRESTO_ALLOC(path, char *, input.namelen + 1);
if ( !path ) {
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.volname, input.namelen);
- if ( error ) {
+ if (copy_from_user(path, input.volname, input.namelen)) {
PRESTO_FREE(path, input.namelen + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.namelen] = '\0';
fset = kml_getfset (path);
@@ -138,7 +133,8 @@
strlen (close->path) + 1, input.pathlen);
error = -ENOMEM;
}
- copy_to_user((char *)arg, &input, sizeof (input));
+ if (copy_to_user((char *)arg, &input, sizeof (input)))
+ return -EFAULT;
}
return error;
}
@@ -161,10 +157,9 @@
char *path;

ENTRY;
- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.namelen + 1);
@@ -172,11 +167,11 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.volname, input.namelen);
+ if (copy_from_user(path, input.volname, input.namelen)) {
if ( error ) {
PRESTO_FREE(path, input.namelen + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.namelen] = '\0';
fset = kml_getfset (path);
@@ -193,7 +188,8 @@
#if 0
input.newpos = kml_upc->newpos;
input.count = kml_upc->count;
- copy_to_user((char *)arg, &input, sizeof (input));
+ if (copy_to_user((char *)arg, &input, sizeof (input)))
+ return -EFAULT;
#endif
return error;
}
diff -Nru a/fs/intermezzo/psdev.c b/fs/intermezzo/psdev.c
--- a/fs/intermezzo/psdev.c Sun May 19 02:07:36 2002
+++ b/fs/intermezzo/psdev.c Sun May 19 02:07:36 2002
@@ -149,9 +149,8 @@
return -EINVAL;
}

- error = copy_from_user(&hdr, buf, sizeof(hdr));
- if ( error )
- return error;
+ if (copy_from_user(&hdr, buf, sizeof(hdr)))
+ return -EFAULT;

CDEBUG(D_PSDEV, "(process,opc,uniq)=(%d,%d,%d)\n",
current->pid, hdr.opcode, hdr.unique);
@@ -183,9 +182,8 @@
req->rq_bufsize, count, hdr.opcode, hdr.unique);
count = req->rq_bufsize; /* don't have more space! */
}
- error = copy_from_user(req->rq_data, buf, count);
- if ( error )
- return error;
+ if (copy_from_user(req->rq_data, buf, count))
+ return -EFAULT;

/* adjust outsize: good upcalls can be aware of this */
req->rq_rep_size = count;
@@ -280,14 +278,12 @@
char * tmp;
int error;

- error = copy_from_user(&readmount, (void *)arg,
- sizeof(readmount));
- if ( error ) {
+ if (copy_from_user(&readmount, (void *)arg, sizeof(readmount)))
printk("psdev: can't copy %Zd bytes from %p to %p\n",
sizeof(readmount), (struct readmount *) arg,
&readmount);
EXIT;
- return error;
+ return -EFAULT;
}

len = readmount.io_len;
@@ -307,15 +303,16 @@
* I mean, let's let the compiler do a little work ...
* gcc suggested the extra ()
*/
- error = copy_to_user(readmount.io_string, tmp, outlen);
- if ( error ) {
+ if (copy_to_user(readmount.io_string, tmp, outlen)) {
CDEBUG(D_PSDEV, "Copy_to_user string 0x%p failed\n",
readmount.io_string);
+ error = -EFAULT;
}
- if ((!error) && (error = copy_to_user(&(user_readmount->io_len),
- &outlen, sizeof(int))) ) {
+ if (!error && copy_to_user(&(user_readmount->io_len),
+ &outlen, sizeof(int))) {
CDEBUG(D_PSDEV, "Copy_to_user len @0x%p failed\n",
&(user_readmount->io_len));
+ error = -EFAULT;
}

PRESTO_FREE(tmp, len);
@@ -360,10 +357,9 @@
int path_len;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.path_len + 1);
@@ -371,11 +367,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.path, input.path_len);
- if ( error ) {
+ if (copy_from_user(path, input.path, input.path_len)) {
PRESTO_FREE(path, input.path_len + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.path_len] = '\0';
CDEBUG(D_PSDEV, "clear_fsetroot: path %s\n", path);
@@ -401,10 +396,9 @@
int path_len;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.path_len + 1);
@@ -412,11 +406,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.path, input.path_len);
- if ( error ) {
+ if (copy_from_user(path, input.path, input.path_len)) {
PRESTO_FREE(path, input.path_len + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.path_len] = '\0';
CDEBUG(D_PSDEV, "clear_all_fsetroot: path %s\n", path);
@@ -440,10 +433,9 @@
int path_len;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.path_len + 1);
@@ -451,11 +443,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.path, input.path_len);
- if ( error ) {
+ if (copy_from_user(path, input.path, input.path_len)) {
PRESTO_FREE(path, input.path_len + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.path_len] = '\0';
CDEBUG(D_PSDEV, "get_kmlsize: len %d path %s\n",
@@ -474,7 +465,9 @@
CDEBUG(D_PSDEV, "get_kmlsize: size = %Zd\n", size);

EXIT;
- return copy_to_user((char *)arg, &input, sizeof(input));
+ if (copy_to_user((char *)arg, &input, sizeof(input)))
+ return -EFAULT;
+ return 0;
}

case PRESTO_GET_RECNO: {
@@ -488,10 +481,9 @@
int path_len;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.path_len + 1);
@@ -499,11 +491,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.path, input.path_len);
- if ( error ) {
+ if (copy_from_user(path, input.path, input.path_len)) {
PRESTO_FREE(path, input.path_len + 1);
EXIT;
- return error;
+ return -EFAULT;
}
path[input.path_len] = '\0';
CDEBUG(D_PSDEV, "get_recno: len %d path %s\n",
@@ -522,7 +513,9 @@
CDEBUG(D_PSDEV, "get_recno: recno = %d\n", (int) recno);

EXIT;
- return copy_to_user((char *)arg, &input, sizeof(input));
+ if (copy_to_user((char *)arg, &input, sizeof(input)))
+ return -EFAULT;
+ return 0;
}

case PRESTO_SET_FSETROOT: {
@@ -543,10 +536,9 @@
int flags;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(path, char *, input.path_len + 1);
@@ -554,9 +546,9 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(path, input.path, input.path_len);
- if ( error ) {
+ if (copy_from_user(path, input.path, input.path_len)) {
EXIT;
+ error -EFAULT;
goto exit_free_path;
}
path[input.path_len] = '\0';
@@ -567,9 +559,9 @@
EXIT;
goto exit_free_path;
}
- error = copy_from_user(fsetname, input.name, input.name_len);
- if ( error ) {
+ if (copy_from_user(fsetname, input.name, input.name_len)) {
EXIT;
+ error = -EFAULT;
goto exit_free_fsetname;
}
fsetname[input.name_len] = '\0';
@@ -621,12 +613,11 @@
struct psdev_opt *user_opt = (struct psdev_opt *) arg;
int error;

- error = copy_from_user(&kopt, (void *)arg, sizeof(kopt));
- if ( error ) {
+ if (copy_from_user(&kopt, (void *)arg, sizeof(kopt))) {
printk("psdev: can't copyin %Zd bytes from %p to %p\n",
sizeof(kopt), (struct kopt *) arg, &kopt);
EXIT;
- return error;
+ return -EFAULT;
}
minor = minor(dev);
if (cmd == PRESTO_SETOPT)
@@ -650,12 +641,11 @@
return error;
}

- error = copy_to_user(user_opt, &kopt, sizeof(kopt));
- if ( error ) {
+ if (copy_to_user(user_opt, &kopt, sizeof(kopt))) {
CDEBUG(D_PSDEV, "Copy_to_user opt 0x%p failed\n",
user_opt);
EXIT;
- return error;
+ return -EFAULT;
}
CDEBUG(D_PSDEV, "dosetopt minor %d, opt %d, val %d return %d\n",
minor, kopt.optname, kopt.optval, error);
@@ -668,10 +658,9 @@
struct lento_input_attr input;
struct iattr iattr;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
iattr.ia_valid = input.valid;
iattr.ia_mode = (umode_t)input.mode;
@@ -692,10 +681,9 @@
int error;
struct lento_input_mode input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_create(input.name, input.mode, &input.info);
@@ -707,10 +695,9 @@
int error;
struct lento_input_old_new input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_link(input.oldname, input.newname, &input.info);
@@ -722,10 +709,9 @@
int error;
struct lento_input input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_unlink(input.name, &input.info);
@@ -737,10 +723,9 @@
int error;
struct lento_input_old_new input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_symlink(input.oldname, input.newname,&input.info);
@@ -752,10 +737,9 @@
int error;
struct lento_input_mode input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_mkdir(input.name, input.mode, &input.info);
@@ -767,10 +751,9 @@
int error;
struct lento_input input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_rmdir(input.name, &input.info);
@@ -782,10 +765,9 @@
int error;
struct lento_input_dev input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_mknod(input.name, input.mode,
@@ -798,10 +780,9 @@
int error;
struct lento_input_old_new input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

error = lento_rename(input.oldname, input.newname, &input.info);
@@ -817,30 +798,27 @@
char *name;
char *buffer;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

/* Now setup the input parameters */
PRESTO_ALLOC(name, char *, input.name_len+1);
/* We need null terminated strings for attr names */
name[input.name_len] = '\0';
- error=copy_from_user(name, input.name, input.name_len);
- if ( error ) {
+ if (copy_from_user(name, input.name, input.name_len)) {
EXIT;
PRESTO_FREE(name,input.name_len+1);
- return error;
+ return -EFAULT;
}

PRESTO_ALLOC(buffer, char *, input.buffer_len+1);
- error=copy_from_user(buffer, input.buffer, input.buffer_len);
- if ( error ) {
+ if (copy_from_user(buffer, input.buffer, input.buffer_len)) {
EXIT;
PRESTO_FREE(name,input.name_len+1);
PRESTO_FREE(buffer,input.buffer_len+1);
- return error;
+ return -EFAULT;
}
/* Make null terminated for easy printing */
buffer[input.buffer_len]='\0';
@@ -869,21 +847,19 @@
struct lento_input_ext_attr input;
char *name;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

/* Now setup the input parameters */
PRESTO_ALLOC(name, char *, input.name_len+1);
/* We need null terminated strings for attr names */
name[input.name_len] = '\0';
- error=copy_from_user(name, input.name, input.name_len);
- if ( error ) {
+ if (copy_from_user(name, input.name, input.name_len)) {
EXIT;
PRESTO_FREE(name,input.name_len+1);
- return error;
+ return -EFAULT;
}

CDEBUG(D_PSDEV," delextattr params: name %s,"
@@ -907,10 +883,9 @@
struct lento_input_iopen input;
int error;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

input.fd = lento_iopen(input.name, (ino_t)input.ino,
@@ -921,17 +896,18 @@
return input.fd;
}
EXIT;
- return copy_to_user((char *)arg, &input, sizeof(input));
+ if (copy_to_user((char *)arg, &input, sizeof(input)))
+ return -EFAULT;
+ return 0;
}

case PRESTO_VFS_CLOSE: {
int error;
struct lento_input_close input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}

CDEBUG(D_PIOCTL, "lento_close file descriptor: %d\n", input.fd);
@@ -952,10 +928,9 @@
struct presto_version remote_file_version;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
user_path = input.path;

@@ -964,11 +939,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(input.path, user_path, input.path_len);
- if ( error ) {
+ if (copy_from_user(input.path, user_path, input.path_len)) {
EXIT;
PRESTO_FREE(input.path, input.path_len + 1);
- return error;
+ return -EFAULT;
}
input.path[input.path_len] = '\0';

@@ -996,10 +970,9 @@
struct lento_vfs_context info;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
user_path = input.path;

@@ -1008,11 +981,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(input.path, user_path, input.path_len);
- if ( error ) {
+ if (copy_from_user(input.path, user_path, input.path_len)) {
EXIT;
PRESTO_FREE(input.path, input.path_len + 1);
- return error;
+ return -EFAULT;
}
input.path[input.path_len] = '\0';

@@ -1035,10 +1007,9 @@
__u32 path_len;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
user_path = input.path;

@@ -1047,11 +1018,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(input.path, user_path, input.path_len);
- if ( error ) {
+ if (copy_from_user(input.path, user_path, input.path_len)) {
EXIT;
PRESTO_FREE(input.path, input.path_len + 1);
- return error;
+ return -EFAULT;
}
input.path[input.path_len] = '\0';

@@ -1072,10 +1042,9 @@
__u32 recno;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
user_path = input.path;

@@ -1084,11 +1053,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(input.path, user_path, input.path_len);
- if ( error ) {
+ if (copy_from_user(input.path, user_path, input.path_len)) {
EXIT;
PRESTO_FREE(input.path, input.path_len + 1);
- return error;
+ return -EFAULT;
}
input.path[input.path_len] = '\0';

@@ -1111,10 +1079,9 @@
char *path;
} input;

- error = copy_from_user(&input, (char *)arg, sizeof(input));
- if ( error ) {
+ if (copy_from_user(&input, (char *)arg, sizeof(input))) {
EXIT;
- return error;
+ return -EFAULT;
}
user_path = input.path;

@@ -1123,11 +1090,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(input.path, user_path, input.path_len);
- if ( error ) {
+ if (copy_from_user(input.path, user_path, input.path_len)) {
EXIT;
PRESTO_FREE(input.path, input.path_len + 1);
- return error;
+ return -EFAULT;
}
input.path[input.path_len] = '\0';

@@ -1190,7 +1156,9 @@
}
/* return the correct cookie to wait for */
input.mark_what = res;
- return copy_to_user((char *)arg, &input, sizeof(input));
+ if (copy_to_user((char *)arg, &input, sizeof(input)))
+ return -EFAULT;
+ return 0;
}

#ifdef CONFIG_KREINT
@@ -1211,11 +1179,10 @@
char *path;
} permit;

- error = copy_from_user(&permit, (char *)arg, sizeof(permit));
- if ( error ) {
+ if (copy_from_user(&permit, (char *)arg, sizeof(permit))) {
EXIT;
- return error;
- }
+ return -EFAULT;
+ }
user_path = permit.path;

PRESTO_ALLOC(permit.path, char *, permit.path_len + 1);
@@ -1223,11 +1190,10 @@
EXIT;
return -ENOMEM;
}
- error = copy_from_user(permit.path, user_path, permit.path_len);
- if ( error ) {
+ if (copy_from_user(permit.path, user_path, permit.path_len)) {
EXIT;
PRESTO_FREE(permit.path, permit.path_len + 1);
- return error;
+ return -EFAULT;
}
permit.path[permit.path_len] = '\0';

@@ -1241,7 +1207,9 @@
return error;
}
/* return the correct cookie to wait for */
- return copy_to_user((char *)arg, &permit, sizeof(permit));
+ if (copy_to_user((char *)arg, &permit, sizeof(permit)))
+ return -EFAULT;
+ return 0;
}