[PATCH] nfs-utils: Fix the error handling if the lseek fails

[PATCH] nfs-utils: Fix the error handling if the lseek fails

[Alice J Mitchell]

The error case when lseek returns a negative value was not correctly handled,
and the error cleanup routine was potentially leaking memory also.

Signed-off-by: Alice J Mitchell <ajmitchell@redhat.com>
---
 support/nfs/conffile.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
index b6400be..6ba8a35 100644
--- a/support/nfs/conffile.c
+++ b/support/nfs/conffile.c
@@ -500,7 +500,7 @@ conf_readfile(const char *path)
 
 	if ((stat (path, &sb) == 0) || (errno != ENOENT)) {
 		char *new_conf_addr = NULL;
-		size_t sz = sb.st_size;
+		off_t sz;
 		int fd = open (path, O_RDONLY, 0);
 
 		if (fd == -1) {
@@ -517,6 +517,11 @@ conf_readfile(const char *path)
 
 		/* only after we have the lock, check the file size ready to read it */
 		sz = lseek(fd, 0, SEEK_END);
+		if (sz < 0) {
+			xlog_warn("conf_readfile: unable to determine file size: %s",
+				  strerror(errno));
+			goto fail;
+		}
 		lseek(fd, 0, SEEK_SET);
 
 		new_conf_addr = malloc(sz+1);
@@ -2162,6 +2167,7 @@ conf_write(const char *filename, const char *section, const char *arg,
 	ret = 0;
 
 cleanup:
+	flush_outqueue(&inqueue, NULL);
 	flush_outqueue(&outqueue, NULL);
 
 	if (buff)
-- 
1.8.3.1

Re: [PATCH] nfs-utils: Fix the error handling if the lseek fails

[Steve Dickson]

On 8/1/19 9:32 AM, Alice J Mitchell wrote:
> The error case when lseek returns a negative value was not correctly handled,
> and the error cleanup routine was potentially leaking memory also.
> 
> Signed-off-by: Alice J Mitchell <ajmitchell@redhat.com>
Committed... 

steved.

> ---
>  support/nfs/conffile.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
> index b6400be..6ba8a35 100644
> --- a/support/nfs/conffile.c
> +++ b/support/nfs/conffile.c
> @@ -500,7 +500,7 @@ conf_readfile(const char *path)
>  
>  	if ((stat (path, &sb) == 0) || (errno != ENOENT)) {
>  		char *new_conf_addr = NULL;
> -		size_t sz = sb.st_size;
> +		off_t sz;
>  		int fd = open (path, O_RDONLY, 0);
>  
>  		if (fd == -1) {
> @@ -517,6 +517,11 @@ conf_readfile(const char *path)
>  
>  		/* only after we have the lock, check the file size ready to read it */
>  		sz = lseek(fd, 0, SEEK_END);
> +		if (sz < 0) {
> +			xlog_warn("conf_readfile: unable to determine file size: %s",
> +				  strerror(errno));
> +			goto fail;
> +		}
>  		lseek(fd, 0, SEEK_SET);
>  
>  		new_conf_addr = malloc(sz+1);
> @@ -2162,6 +2167,7 @@ conf_write(const char *filename, const char *section, const char *arg,
>  	ret = 0;
>  
>  cleanup:
> +	flush_outqueue(&inqueue, NULL);
>  	flush_outqueue(&outqueue, NULL);
>  
>  	if (buff)
>