[PATCH] nfs: fix null checking in nfs_get_option_str()

From: Xi Wang
Date: Fri Jan 04 2013 - 03:22:57 EST

The following null pointer check is broken.

*option = match_strdup(args);
return !option;

The pointer `option' must be non-null, and thus `!option' is always false.
Use `!*option' instead.

The bug was introduced in commit c5cb09b6f8 ("Cleanup: Factor out some
cut-and-paste code.").

Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
fs/nfs/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index c25cadf8..2e7e8c8 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1152,7 +1152,7 @@ static int nfs_get_option_str(substring_t args[], char **option)
*option = match_strdup(args);
- return !option;
+ return !*option;

static int nfs_get_option_ul(substring_t args[], unsigned long *option)

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