RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-03-25 04:19:05 +00:00
Code Issues Projects Releases Wiki Activity

vqavideo: check chunk sizes before reading chunks

Browse Source 
Fixes out of array writes

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit ab6c9332bf)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-25 06:11:59 +01:00
parent fee26d352a
commit 13093f9767
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libavcodec/vqavideo.c
View File

@ -526,6 +526,11 @@ static void vqa_decode_chunk(VqaContext *s)
chunk_size = AV_RB32(&s->buf[cbp0_chunk + 4]);
cbp0_chunk += CHUNK_PREAMBLE_SIZE;
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (0x%X bytes)\n", chunk_size);
return AVERROR_INVALIDDATA;
}
/* accumulate partial codebook */
memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
&s->buf[cbp0_chunk], chunk_size);
@ -549,6 +554,11 @@ static void vqa_decode_chunk(VqaContext *s)
chunk_size = AV_RB32(&s->buf[cbpz_chunk + 4]);
cbpz_chunk += CHUNK_PREAMBLE_SIZE;
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (0x%X bytes)\n", chunk_size);
return AVERROR_INVALIDDATA;
}
/* accumulate partial codebook */
memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
&s->buf[cbpz_chunk], chunk_size);