linux-kernel - [PATCH] staging: lustre: lustre: include: lustre_update.h: Fix for possible null pointer dereference

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Date:	Sun, 21 Dec 2014 23:43:51 +0100
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	HPDD-discuss@...ts.01.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: lustre: lustre: include: lustre_update.h:  Fix for possible null pointer dereference

The NULL check was done to late, and there it was a risk
of a possible null pointer dereference.

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/staging/lustre/lustre/include/lustre_update.h |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/include/lustre_update.h b/drivers/staging/lustre/lustre/include/lustre_update.h
index 84defce..00e1361 100644
--- a/drivers/staging/lustre/lustre/include/lustre_update.h
+++ b/drivers/staging/lustre/lustre/include/lustre_update.h
@@ -165,12 +165,14 @@ static inline int update_get_reply_buf(struct update_reply *reply, void **buf,
 	int  result;
 
 	ptr = update_get_buf_internal(reply, index, &size);
+
+	LASSERT((ptr != NULL && size >= sizeof(int)));
+
 	result = *(int *)ptr;
 
 	if (result < 0)
 		return result;
 
-	LASSERT((ptr != NULL && size >= sizeof(int)));
 	*buf = ptr + sizeof(int);
 	return size - sizeof(int);
 }
-- 
1.7.10.4

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