plt: Fix packet length check in pkt_put()

pkt_len() return the amount of bytes the packet currently holds.
Together with the newly added bytes it mustn't exceed p->size.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 1 deletions

diff --git a/pkt.h b/pkt.h
index 5b8640c..cd08a50 100644
--- a/pkt.h
+++ b/pkt.h
@@ -72,7 +72,7 @@ static inline uint8_t *pkt_put(struct pkt *p, size_t len)
 
 	assert(pkt_invariant(p));
 
-	if (len <= pkt_len(p)) {
+	if (pkt_len(p) + len <= p->size) {
 		data = p->tail;
 		p->tail += len;
 	} else {