truemotion1: check the header size

Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
(cherry picked from commit 2240e2078d53d3cfce8ff1dda64e58fa72038602)

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/truemotion1.c b/libavcodec/truemotion1.c
index 63cd05b66c..2421dacbf3 100644
--- a/libavcodec/truemotion1.c
+++ b/libavcodec/truemotion1.c
@@ -322,6 +322,11 @@ static int truemotion1_decode_header(TrueMotion1Context *s)
         return -1;
     }
 
+    if (header.header_size + 1 > s->size) {
+        av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     /* unscramble the header bytes with a XOR operation */
     for (i = 1; i < header.header_size; i++)
         header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];