[U-Boot] [PATCH] mtdparts: Fix final outstanding issue reported by Coverity

Tom Rini trini at konsulko.com
Mon Aug 21 00:05:40 UTC 2017

As part of fixing the previously reported issues, it was missed that in
the case of mtdparts_init() we need to make sure that tmp_ep is long
enough to contain PARTITION_MAXLEN and a NULL termination.  Then, to be
sure the buffer is NULL terminated, zero the entire buffer rather than
just ensuring the first character is NULL.

Cc: Lothar WaƟmann <LW at KARO-electronics.de>
Cc: Maxime Ripard <maxime.ripard at free-electrons.com>
Reported-by: Coverity (CID: 166329)
Signed-off-by: Tom Rini <trini at konsulko.com>
 cmd/mtdparts.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmd/mtdparts.c b/cmd/mtdparts.c
index 72bff92a9aee..6e12275b4083 100644
--- a/cmd/mtdparts.c
+++ b/cmd/mtdparts.c
@@ -1726,7 +1726,7 @@ int mtdparts_init(void)
 	const char *ids, *parts;
 	const char *current_partition;
 	int ids_changed;
-	char tmp_ep[PARTITION_MAXLEN];
+	char tmp_ep[PARTITION_MAXLEN + 1];
 	char tmp_parts[MTDPARTS_MAXLEN];
@@ -1750,7 +1750,7 @@ int mtdparts_init(void)
 	/* save it for later parsing, cannot rely on current partition pointer
 	 * as 'partition' variable may be updated during init */
-	tmp_ep[0] = '\0';
+	memset(tmp_parts, 0, sizeof(tmp_parts));
 	if (current_partition)
 		strncpy(tmp_ep, current_partition, PARTITION_MAXLEN);

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