hash: Ensure verification hex pairs are terminated

This function seems to assume that the chr[] variable contains zeros at
the start, which is not always true. Use strlcpy() to be safe.

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

diff --git a/common/hash.c b/common/hash.c
index 90cf46b..059d381 100644 (file)
--- a/common/hash.c
+++ b/common/hash.c
@@ -396,7 +396,7 @@ int hash_parse_string(const char *algo_name, const char *str, uint8_t *result)
        for (i = 0; i < algo->digest_size; i++) {
                char chr[3];
 
-               strncpy(chr, &str[i * 2], 2);
+               strlcpy(chr, &str[i * 2], 3);
                result[i] = simple_strtoul(chr, NULL, 16);
        }