From: Steve Sakoman <steve@sakoman.com>
Date: Thu, 7 Jun 2012 17:19:18 +0000 (-0700)
Subject: cmd_nand: fix crashing bug in nand read/write
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=8d75c8964baa76d097edb4aa4b0474600f2998ba;p=u-boot.git

cmd_nand: fix crashing bug in nand read/write

Commit 418396e212b59bf907dbccad997ff50f7eb61b16 introduced a
bug that causes nand read and nand write to crash in strcmp
due to a null pointer.

Root cause is that strchr(cmd, '.') returns a null pointer when
the input string does not contain a '.'

The strcmp function does not check for null pointers, resulting
in a crash.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Scott Wood <scott@tyr.buserror.net>
---

diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index fa442951d8..a91ccf4df3 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -617,7 +617,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
 
 		s = strchr(cmd, '.');
 
-		if (!strcmp(s, ".raw")) {
+		if (s && !strcmp(s, ".raw")) {
 			raw = 1;
 
 			if (arg_off(argv[3], &dev, &off, &size))