linux-ext4 - [PATCH v2 1/2] e2p: Fix segfault in e2p

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Message-Id: <20170718214823.22649-2-abuchbinder@google.com>
Date:   Tue, 18 Jul 2017 14:48:22 -0700
From:   Adam Buchbinder <abuchbinder@...gle.com>
To:     linux-ext4@...r.kernel.org
Cc:     Adam Buchbinder <abuchbinder@...gle.com>
Subject: [PATCH v2 1/2] e2p: Fix segfault in e2p_os2string.

Passing in a negative integer would lead to a segfault, and
a crafted filesystem image could trigger that.

Signed-off-by: Adam Buchbinder <abuchbinder@...gle.com>
---
 lib/e2p/ostype.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/e2p/ostype.c b/lib/e2p/ostype.c
index 7f088446..c5fd8ab3 100644
--- a/lib/e2p/ostype.c
+++ b/lib/e2p/ostype.c
@@ -30,7 +30,7 @@ char *e2p_os2string(int os_type)
         const char	*os;
 	char 		*ret;

-	if (os_type <= EXT2_OS_LITES)
+	if (os_type >= 0 && os_type <= EXT2_OS_LITES)
 		os = os_tab[os_type];
 	else
 		os = "(unknown os)";
-- 
2.14.0.rc0.284.gd933b75aa4-goog