[libav-devel] [PATCH 03/17] avidec: Make sure a packet is large enough before reading its data

[Martin Storsjö]

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-sta...@libav.org
---
 libavformat/avidec.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 1212c6a..3616281 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -816,7 +816,8 @@ fail:
 
 static int read_gab2_sub(AVStream *st, AVPacket *pkt)
 {
-    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
+    if (pkt->size >= 7 &&
+        !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
         uint8_t desc[256];
         int score      = AVPROBE_SCORE_EXTENSION, ret;
         AVIStream *ast = st->priv_data;
-- 
1.7.9.4

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