tpm: Check that parse_byte_string() has data to parse

Rather then crashing when there is no data, print an error. The error is
printed by the caller to parse_byte_string().

Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>

diff --git a/common/cmd_tpm.c b/common/cmd_tpm.c
index 65e7371e8074f6d3129218469fc6cb666067a2aa..e9c661821ce747e41ec099ba081fc32697035da6 100644 (file)
--- a/common/cmd_tpm.c
+++ b/common/cmd_tpm.c
@@ -58,6 +58,8 @@ static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr)
        size_t count, length;
        int i;
 
+       if (!bytes)
+               return NULL;
        length = strlen(bytes);
        count = length / 2;