env: Don't match empty variable name in env_match()

Do we really allow zero-length variable name? I guess not.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/cmd/nvedit.c b/cmd/nvedit.c
index 5b1d4c2..8d53579 100644 (file)
--- a/cmd/nvedit.c
+++ b/cmd/nvedit.c
@@ -708,7 +708,7 @@ char *from_env(const char *envvar)
 
 static const char *env_match(const char *p, const char *s1)
 {
-       if (s1 == NULL)
+       if (s1 == NULL || *s1 == '\0')
                return NULL;
 
        while (*s1 == *p++)