[PATCH v2 1/2] e2p: Fix segfault in e2p_os2string.

[Adam Buchbinder <abuchbinder@xxxxxxxxxx>]

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

Signed-off-by: Adam Buchbinder <abuchbinder@xxxxxxxxxx>
---
 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