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

From: Myklebust, Trond
Date: Fri Jan 04 2013 - 10:55:04 EST

On Fri, 2013-01-04 at 03:22 -0500, Xi Wang wrote:
+AD4- The following null pointer check is broken.
+AD4- +ACo-option +AD0- match+AF8-strdup(args)+ADs-
+AD4- return +ACE-option+ADs-
+AD4- The pointer +AGA-option' must be non-null, and thus +AGAAIQ-option' is always false.
+AD4- Use +AGAAIQAq-option' instead.
+AD4- The bug was introduced in commit c5cb09b6f8 (+ACI-Cleanup: Factor out some
+AD4- cut-and-paste code.+ACI-).
+AD4- Signed-off-by: Xi Wang
+AD4- Cc:
+AD4- ---
+AD4- fs/nfs/super.c +AHw- 2 +--
+AD4- 1 file changed, 1 insertion(+-), 1 deletion(-)
+AD4- diff --git a/fs/nfs/super.c b/fs/nfs/super.c
+AD4- index c25cadf8..2e7e8c8 100644
+AD4- --- a/fs/nfs/super.c
+AD4- +-+-+- b/fs/nfs/super.c
+AD4- +AEAAQA- -1152,7 +-1152,7 +AEAAQA- static int nfs+AF8-get+AF8-option+AF8-str(substring+AF8-t args+AFsAXQ-, char +ACoAKg-option)
+AD4- +AHs-
+AD4- kfree(+ACo-option)+ADs-
+AD4- +ACo-option +AD0- match+AF8-strdup(args)+ADs-
+AD4- - return +ACE-option+ADs-
+AD4- +- return +ACEAKg-option+ADs-
+AD4- +AH0-
+AD4- static int nfs+AF8-get+AF8-option+AF8-ul(substring+AF8-t args+AFsAXQ-, unsigned long +ACo-option)

Thank you+ACE- Applied to the bugfixes branch.

Trond Myklebust
Linux NFS client maintainer

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