linux-kernel - [PATCH] staging: lustre: lustre: obdclass: lprocfs_status.c: Fix for possible null pointer dereference

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Message-Id: <1418597547-25086-1-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Sun, 14 Dec 2014 23:52:27 +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>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Greg Donald <gdonald@...il.com>,
	"John L. Hammond" <john.hammond@...el.com>,
	Andriy Skulysh <Andriy_Skulysh@...atex.com>,
	Fabian Frederick <fabf@...net.be>,
	James Simmons <uja.ornl@...il.com>, HPDD-discuss@...ts.01.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: lustre: lustre: obdclass: lprocfs_status.c:  Fix for possible null pointer dereference

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 .../lustre/lustre/obdclass/lprocfs_status.c        |   24 +++++++++++---------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
index 61e04af..5227324 100644
--- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
+++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
@@ -1897,17 +1897,19 @@ int lprocfs_write_frac_u64_helper(const char *buffer, unsigned long count,
 	}
 
 	units = 1;
-	switch (*end) {
-	case 'p': case 'P':
-		units <<= 10;
-	case 't': case 'T':
-		units <<= 10;
-	case 'g': case 'G':
-		units <<= 10;
-	case 'm': case 'M':
-		units <<= 10;
-	case 'k': case 'K':
-		units <<= 10;
+	if (end) {
+		switch (*end) {
+		case 'p': case 'P':
+			units <<= 10;
+		case 't': case 'T':
+			units <<= 10;
+		case 'g': case 'G':
+			units <<= 10;
+		case 'm': case 'M':
+			units <<= 10;
+		case 'k': case 'K':
+			units <<= 10;
+		}
 	}
 	/* Specified units override the multiplier */
 	if (units)
-- 
1.7.10.4

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