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[FFmpeg-devel,5/5] avcodec/dnxhd_parser: Fix parser when input does not have nicely sized packets

Message ID 20190706105749.11410-5-michael@niedermayer.cc
State Accepted
Commit 2d900d8fe0aaf9c984e024956eb537ecdfe2c949
Headers show

Commit Message

Michael Niedermayer July 6, 2019, 10:57 a.m. UTC 
Fixes: out of array access
Fixes: 15522/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DNXHD_fuzzer-5747756078989312

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/dnxhd_parser.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/dnxhd_parser.c b/libavcodec/dnxhd_parser.c
index 31a3158fea..63b4ff89e1 100644
--- a/libavcodec/dnxhd_parser.c
+++ b/libavcodec/dnxhd_parser.c
@@ -79,8 +79,9 @@  static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
                     if (remaining <= 0)
                         continue;
                 }
+                remaining += i - 47;
                 dctx->remaining = remaining;
-                if (buf_size - i + 47 >= dctx->remaining) {
+                if (buf_size >= dctx->remaining) {
                     pc->frame_start_found = 0;
                     pc->state64 = -1;
                     dctx->cur_byte = 0;