linux-kernel - [PATCH 3.4 025/172] NFSv4.1: Fix a kfree() of uninitialised pointers in decode_cb_sequence

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Message-Id: <1434443826-4929-25-git-send-email-lizf@kernel.org>
Date:	Tue, 16 Jun 2015 16:34:39 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 025/172] NFSv4.1: Fix a kfree() of uninitialised pointers in decode_cb_sequence_args

From: Trond Myklebust <trond.myklebust@...marydata.com>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit d8ba1f971497c19cf80da1ea5391a46a5f9fbd41 upstream.

If the call to decode_rc_list() fails due to a memory allocation error,
then we need to truncate the array size to ensure that we only call
kfree() on those pointer that were allocated.

Reported-by: David Ramos <daramos@...nford.edu>
Fixes: 4aece6a19cf7f ("nfs41: cb_sequence xdr implementation")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/nfs/callback_xdr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 27c2969..3abfd5a 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -463,8 +463,10 @@ static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
 
 		for (i = 0; i < args->csa_nrclists; i++) {
 			status = decode_rc_list(xdr, &args->csa_rclists[i]);
-			if (status)
+			if (status) {
+				args->csa_nrclists = i;
 				goto out_free;
+			}
 		}
 	}
 	status = 0;
-- 
1.9.1

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