[PATCH 1/2] pcapng: fix fortified memcpy warning

[Stephen Hemminger <stephen@networkplumber.org>]

When adding option with no data, the rte_pcapng_add_option would
call memcpy with src of NULL and size of zero. This generates a
warning if fortify is enabled.

Bugzilla ID: 1446
Fixes: 8d23ce8f5ee9 ("pcapng: add new library for writing pcapng files")

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/pcapng/rte_pcapng.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/pcapng/rte_pcapng.c b/lib/pcapng/rte_pcapng.c
index f74ec939a9..7254defce7 100644
--- a/lib/pcapng/rte_pcapng.c
+++ b/lib/pcapng/rte_pcapng.c
@@ -128,7 +128,8 @@ pcapng_add_option(struct pcapng_option *popt, uint16_t code,
 {
 	popt->code = code;
 	popt->length = len;
-	memcpy(popt->data, data, len);
+	if (len > 0)
+		memcpy(popt->data, data, len);
 
 	return (struct pcapng_option *)((uint8_t *)popt + pcapng_optlen(len));
 }
-- 
2.43.0