* [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent()
@ 2008-12-05 9:12 David Howells
2008-12-05 9:41 ` Christoph Hellwig
2008-12-05 13:24 ` Hugh Dickins
0 siblings, 2 replies; 4+ messages in thread
From: David Howells @ 2008-12-05 9:12 UTC (permalink / raw)
To: torvalds, akpm; +Cc: dhowells, bfields, hch, linux-kernel
Returning NULL from fh_to_dentry() and fh_to_parent() is not permitted, so
return -ESTALE instead. exportfs_decode_fh() does not check for NULL, but
will try to dereference it as IS_ERR() does not check for it.
The generic_fh_to_dentry() and generic_fh_to_parent() functions also no longer
return NULL, but return -ESTALE instead.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: J. Bruce Fields <bfields@citi.umich.edu>
---
fs/fat/inode.c | 2 +-
fs/fuse/inode.c | 4 ++--
fs/gfs2/ops_export.c | 4 ++--
fs/isofs/export.c | 4 ++--
fs/libfs.c | 4 ++--
fs/ocfs2/export.c | 4 ++--
fs/udf/namei.c | 4 ++--
fs/xfs/linux-2.6/xfs_export.c | 2 +-
8 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index d937aaf..cac84f2 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -657,7 +657,7 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
u32 *fh = fid->raw;
if (fh_len < 5 || fh_type != 3)
- return NULL;
+ return ERR_PTR(-ESTALE);
inode = ilookup(sb, fh[0]);
if (!inode || inode->i_generation != fh[1]) {
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 2e99f34..0eb8990 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -653,7 +653,7 @@ static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
struct fuse_inode_handle handle;
if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
- return NULL;
+ return ERR_PTR(-ESTALE);
handle.nodeid = (u64) fid->raw[0] << 32;
handle.nodeid |= (u64) fid->raw[1];
@@ -667,7 +667,7 @@ static struct dentry *fuse_fh_to_parent(struct super_block *sb,
struct fuse_inode_handle parent;
if (fh_type != 0x82 || fh_len < 6)
- return NULL;
+ return ERR_PTR(-ESTALE);
parent.nodeid = (u64) fid->raw[3] << 32;
parent.nodeid |= (u64) fid->raw[4];
diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
index bbb8c36..2864873 100644
--- a/fs/gfs2/ops_export.c
+++ b/fs/gfs2/ops_export.c
@@ -254,7 +254,7 @@ static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
this.no_addr |= be32_to_cpu(fh[3]);
return gfs2_get_dentry(sb, &this);
default:
- return NULL;
+ return ERR_PTR(-ESTALE);
}
}
@@ -273,7 +273,7 @@ static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
parent.no_addr |= be32_to_cpu(fh[7]);
return gfs2_get_dentry(sb, &parent);
default:
- return NULL;
+ return ERR_PTR(-ESTALE);
}
}
diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index e81a305..1b4ee23 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -164,7 +164,7 @@ static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
struct isofs_fid *ifid = (struct isofs_fid *)fid;
if (fh_len < 3 || fh_type > 2)
- return NULL;
+ return ERR_PTR(-ESTALE);
return isofs_export_iget(sb, ifid->block, ifid->offset,
ifid->generation);
@@ -176,7 +176,7 @@ static struct dentry *isofs_fh_to_parent(struct super_block *sb,
struct isofs_fid *ifid = (struct isofs_fid *)fid;
if (fh_type != 2)
- return NULL;
+ return ERR_PTR(-ESTALE);
return isofs_export_iget(sb,
fh_len > 2 ? ifid->parent_block : 0,
diff --git a/fs/libfs.c b/fs/libfs.c
index e960a83..4fe5b5b 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -751,7 +751,7 @@ struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid,
struct inode *inode = NULL;
if (fh_len < 2)
- return NULL;
+ return ERR_PTR(-ESTALE);
switch (fh_type) {
case FILEID_INO32_GEN:
@@ -784,7 +784,7 @@ struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
struct inode *inode = NULL;
if (fh_len <= 2)
- return NULL;
+ return ERR_PTR(-ESTALE);
switch (fh_type) {
case FILEID_INO32_GEN_PARENT:
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 2f27b33..0f1c80f 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -182,7 +182,7 @@ static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
struct ocfs2_inode_handle handle;
if (fh_len < 3 || fh_type > 2)
- return NULL;
+ return ERR_PTR(-ESTALE);
handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
@@ -196,7 +196,7 @@ static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
struct ocfs2_inode_handle parent;
if (fh_type != 2 || fh_len < 6)
- return NULL;
+ return ERR_PTR(-ESTALE);
parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index f84bfaa..e1a1c16 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -1297,7 +1297,7 @@ static struct dentry *udf_fh_to_dentry(struct super_block *sb,
if ((fh_len != 3 && fh_len != 5) ||
(fh_type != FILEID_UDF_WITH_PARENT &&
fh_type != FILEID_UDF_WITHOUT_PARENT))
- return NULL;
+ return ERR_PTR(-ESTALE);
return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
fid->udf.generation);
@@ -1307,7 +1307,7 @@ static struct dentry *udf_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
- return NULL;
+ return ERR_PTR(-ESTALE);
return udf_nfs_get_inode(sb, fid->udf.parent_block,
fid->udf.parent_partref,
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index 7f7abec..f9a51c4 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -150,7 +150,7 @@ xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
struct inode *inode = NULL;
if (fh_len < xfs_fileid_length(fileid_type))
- return NULL;
+ return ERR_PTR(-ESTALE);
switch (fileid_type) {
case FILEID_INO32_GEN_PARENT:
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent()
2008-12-05 9:12 [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent() David Howells
@ 2008-12-05 9:41 ` Christoph Hellwig
2008-12-05 13:24 ` Hugh Dickins
1 sibling, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2008-12-05 9:41 UTC (permalink / raw)
To: David Howells; +Cc: torvalds, akpm, bfields, hch, linux-kernel
On Fri, Dec 05, 2008 at 09:12:56AM +0000, David Howells wrote:
> Returning NULL from fh_to_dentry() and fh_to_parent() is not permitted, so
> return -ESTALE instead. exportfs_decode_fh() does not check for NULL, but
> will try to dereference it as IS_ERR() does not check for it.
>
> The generic_fh_to_dentry() and generic_fh_to_parent() functions also no longer
> return NULL, but return -ESTALE instead.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> Acked-by: J. Bruce Fields <bfields@citi.umich.edu>
Looks good, thanks. Linus, this is regression introduced in 2.6.28 by
me, so please apply.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent()
2008-12-05 9:12 [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent() David Howells
2008-12-05 9:41 ` Christoph Hellwig
@ 2008-12-05 13:24 ` Hugh Dickins
2008-12-05 13:30 ` David Howells
1 sibling, 1 reply; 4+ messages in thread
From: Hugh Dickins @ 2008-12-05 13:24 UTC (permalink / raw)
To: David Howells; +Cc: torvalds, akpm, bfields, hch, linux-kernel
On Fri, 5 Dec 2008, David Howells wrote:
> Returning NULL from fh_to_dentry() and fh_to_parent() is not permitted, so
> return -ESTALE instead. exportfs_decode_fh() does not check for NULL, but
> will try to dereference it as IS_ERR() does not check for it.
>
> The generic_fh_to_dentry() and generic_fh_to_parent() functions also no longer
> return NULL, but return -ESTALE instead.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> Acked-by: J. Bruce Fields <bfields@citi.umich.edu>
This patch looks like it ought to be including mm/shmem.c too?
Which would you prefer, I send a separate patch, or you update this one?
Hugh
> ---
>
> fs/fat/inode.c | 2 +-
> fs/fuse/inode.c | 4 ++--
> fs/gfs2/ops_export.c | 4 ++--
> fs/isofs/export.c | 4 ++--
> fs/libfs.c | 4 ++--
> fs/ocfs2/export.c | 4 ++--
> fs/udf/namei.c | 4 ++--
> fs/xfs/linux-2.6/xfs_export.c | 2 +-
> 8 files changed, 14 insertions(+), 14 deletions(-)
>
>
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index d937aaf..cac84f2 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -657,7 +657,7 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
> u32 *fh = fid->raw;
>
> if (fh_len < 5 || fh_type != 3)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> inode = ilookup(sb, fh[0]);
> if (!inode || inode->i_generation != fh[1]) {
> diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
> index 2e99f34..0eb8990 100644
> --- a/fs/fuse/inode.c
> +++ b/fs/fuse/inode.c
> @@ -653,7 +653,7 @@ static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
> struct fuse_inode_handle handle;
>
> if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> handle.nodeid = (u64) fid->raw[0] << 32;
> handle.nodeid |= (u64) fid->raw[1];
> @@ -667,7 +667,7 @@ static struct dentry *fuse_fh_to_parent(struct super_block *sb,
> struct fuse_inode_handle parent;
>
> if (fh_type != 0x82 || fh_len < 6)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> parent.nodeid = (u64) fid->raw[3] << 32;
> parent.nodeid |= (u64) fid->raw[4];
> diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
> index bbb8c36..2864873 100644
> --- a/fs/gfs2/ops_export.c
> +++ b/fs/gfs2/ops_export.c
> @@ -254,7 +254,7 @@ static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
> this.no_addr |= be32_to_cpu(fh[3]);
> return gfs2_get_dentry(sb, &this);
> default:
> - return NULL;
> + return ERR_PTR(-ESTALE);
> }
> }
>
> @@ -273,7 +273,7 @@ static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
> parent.no_addr |= be32_to_cpu(fh[7]);
> return gfs2_get_dentry(sb, &parent);
> default:
> - return NULL;
> + return ERR_PTR(-ESTALE);
> }
> }
>
> diff --git a/fs/isofs/export.c b/fs/isofs/export.c
> index e81a305..1b4ee23 100644
> --- a/fs/isofs/export.c
> +++ b/fs/isofs/export.c
> @@ -164,7 +164,7 @@ static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
> struct isofs_fid *ifid = (struct isofs_fid *)fid;
>
> if (fh_len < 3 || fh_type > 2)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> return isofs_export_iget(sb, ifid->block, ifid->offset,
> ifid->generation);
> @@ -176,7 +176,7 @@ static struct dentry *isofs_fh_to_parent(struct super_block *sb,
> struct isofs_fid *ifid = (struct isofs_fid *)fid;
>
> if (fh_type != 2)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> return isofs_export_iget(sb,
> fh_len > 2 ? ifid->parent_block : 0,
> diff --git a/fs/libfs.c b/fs/libfs.c
> index e960a83..4fe5b5b 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -751,7 +751,7 @@ struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid,
> struct inode *inode = NULL;
>
> if (fh_len < 2)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> switch (fh_type) {
> case FILEID_INO32_GEN:
> @@ -784,7 +784,7 @@ struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid,
> struct inode *inode = NULL;
>
> if (fh_len <= 2)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> switch (fh_type) {
> case FILEID_INO32_GEN_PARENT:
> diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
> index 2f27b33..0f1c80f 100644
> --- a/fs/ocfs2/export.c
> +++ b/fs/ocfs2/export.c
> @@ -182,7 +182,7 @@ static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
> struct ocfs2_inode_handle handle;
>
> if (fh_len < 3 || fh_type > 2)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
> handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
> @@ -196,7 +196,7 @@ static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
> struct ocfs2_inode_handle parent;
>
> if (fh_type != 2 || fh_len < 6)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
> parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
> diff --git a/fs/udf/namei.c b/fs/udf/namei.c
> index f84bfaa..e1a1c16 100644
> --- a/fs/udf/namei.c
> +++ b/fs/udf/namei.c
> @@ -1297,7 +1297,7 @@ static struct dentry *udf_fh_to_dentry(struct super_block *sb,
> if ((fh_len != 3 && fh_len != 5) ||
> (fh_type != FILEID_UDF_WITH_PARENT &&
> fh_type != FILEID_UDF_WITHOUT_PARENT))
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
> fid->udf.generation);
> @@ -1307,7 +1307,7 @@ static struct dentry *udf_fh_to_parent(struct super_block *sb,
> struct fid *fid, int fh_len, int fh_type)
> {
> if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> return udf_nfs_get_inode(sb, fid->udf.parent_block,
> fid->udf.parent_partref,
> diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
> index 7f7abec..f9a51c4 100644
> --- a/fs/xfs/linux-2.6/xfs_export.c
> +++ b/fs/xfs/linux-2.6/xfs_export.c
> @@ -150,7 +150,7 @@ xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
> struct inode *inode = NULL;
>
> if (fh_len < xfs_fileid_length(fileid_type))
> - return NULL;
> + return ERR_PTR(-ESTALE);
>
> switch (fileid_type) {
> case FILEID_INO32_GEN_PARENT:
>
> --
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent()
2008-12-05 13:24 ` Hugh Dickins
@ 2008-12-05 13:30 ` David Howells
0 siblings, 0 replies; 4+ messages in thread
From: David Howells @ 2008-12-05 13:30 UTC (permalink / raw)
To: Hugh Dickins; +Cc: dhowells, torvalds, akpm, bfields, hch, linux-kernel
Hugh Dickins <hugh@veritas.com> wrote:
> This patch looks like it ought to be including mm/shmem.c too?
> Which would you prefer, I send a separate patch, or you update this one?
I've dispatched a new version.
David
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2008-12-05 13:31 UTC | newest]
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2008-12-05 9:12 [PATCH] EXPORTFS: Don't return NULL from fh_to_dentry()/fh_to_parent() David Howells
2008-12-05 9:41 ` Christoph Hellwig
2008-12-05 13:24 ` Hugh Dickins
2008-12-05 13:30 ` David Howells
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