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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-01-24 22:48:46 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-04-22 23:19:16 +0200 |
| commit | 38adbc6eebd7f2f34ecf1b0b18019e88bad9d9f4 (patch) | |
| tree | 61d9a54a97438a07f8d7ee4d444f57032ae7125d /libavcodec | |
| parent | eddf7e2a3e9459fd26a76fb2984a6c9b994e2d89 (diff) | |
| download | ffmpeg-38adbc6eebd7f2f34ecf1b0b18019e88bad9d9f4.tar.gz | |
avcodec/g2meet: Replace fake allocation avoidance for framebuf
framebuf is only allocated when the new width/height are larger than the old
but nothing sets the old so its always allocated.
Use av_fast_mallocz() instead.
Fixes: Timeout
Fixes: 55094/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5116909932904448
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/g2meet.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c index 32b966e8ef..05b5a5124f 100644 --- a/libavcodec/g2meet.c +++ b/libavcodec/g2meet.c @@ -145,7 +145,8 @@ typedef struct G2MContext { int got_header; uint8_t *framebuf; - int framebuf_stride, old_width, old_height; + int framebuf_stride; + unsigned int framebuf_allocated; uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base; int tile_stride, epic_buf_stride, old_tile_w, old_tile_h; @@ -1160,14 +1161,13 @@ static int g2m_init_buffers(G2MContext *c) { int aligned_height; - if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) { - c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3; - aligned_height = c->height + 15; - av_free(c->framebuf); - c->framebuf = av_calloc(c->framebuf_stride, aligned_height); - if (!c->framebuf) - return AVERROR(ENOMEM); - } + c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3; + aligned_height = c->height + 15; + + av_fast_mallocz(&c->framebuf, &c->framebuf_allocated, c->framebuf_stride * aligned_height); + if (!c->framebuf) + return AVERROR(ENOMEM); + if (!c->synth_tile || !c->jpeg_tile || (c->compression == 2 && !c->epic_buf_base) || c->old_tile_w < c->tile_width || @@ -1617,6 +1617,7 @@ static av_cold int g2m_decode_end(AVCodecContext *avctx) av_freep(&c->jpeg_tile); av_freep(&c->cursor); av_freep(&c->framebuf); + c->framebuf_allocated = 0; return 0; } |