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authorThomas Weber <weber@corscience.de>2010-11-24 13:07:51 +0100
committerWolfgang Denk <wd@denx.de>2010-11-27 23:35:13 +0100
commit7013c06124e9760f75ef194d429ed29fba843eb9 (patch)
tree4fd24ea97e78fb6f140d15db2ff4e5f5b85f1837
parent5904da021449c6d2404485dc1379bf0f3b33414a (diff)
downloadu-boot-linaro-natty-7013c06124e9760f75ef194d429ed29fba843eb9.tar.gz
Common/command: Guard strchr/strlen from NULL pointer
Guard strchr/strlen from being called with NULL pointer. This line is crashing when command "env" is called without subcommand. The cmd is NULL in this case because the calling function "do_env" decremented the argc without checking if there are still arguments available. Signed-off-by: Thomas Weber <weber@corscience.de>
-rw-r--r--common/command.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/common/command.c b/common/command.c
index 0020eacf5..0b1a3fbf9 100644
--- a/common/command.c
+++ b/common/command.c
@@ -108,6 +108,8 @@ cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len)
int len;
int n_found = 0;
+ if (!cmd)
+ return NULL;
/*
* Some commands allow length modifiers (like "cp.b");
* compare command name only until first dot.