Tidy up error checking and fix bug in hash command

There are two problems:

1. The argument count needs to be checked before argv is used
2. When verify is not enabled, we need to define a constant zero value

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/common/cmd_hash.c b/common/cmd_hash.c
index 689c60857249d85ce297f66ce278d2f6d99cef5a..eb6a33873b484a8837476f1d6c6759f1bd5bbe7d 100644 (file)
--- a/common/cmd_hash.c
+++ b/common/cmd_hash.c
@@ -32,11 +32,15 @@ static int do_hash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_HASH_VERIFY
        int verify = 0;
 
+       if (argc < 4)
+               return CMD_RET_USAGE;
        if (!strcmp(argv[1], "-v")) {
                verify = 1;
                argc--;
                argv++;
        }
+#else
+       const int verify = 0;
 #endif
        /* Move forward to 'algorithm' parameter */
        argc--;