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avcodec/hapdec: Change compressed_offset to unsigned 32bit 

Fixes: out of array access
Fixes: 29345/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HAP_fuzzer-5401813482340352
Fixes: 30745/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HAP_fuzzer-5762798221131776

Suggested-by: Anton
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-19 21:16:25 +01:00
parent 029e3c1c70
commit 89fe1935b1
2 changed files with 4 additions and 2 deletions
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2
libavcodec/hap.h
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@ -52,7 +52,7 @@ enum HapSectionType {
typedef struct HapChunk {
enum HapCompressor compressor;
int compressed_offset;
uint32_t compressed_offset;
size_t compressed_size;
int uncompressed_offset;
size_t uncompressed_size;

4
libavcodec/hapdec.c
View File

@ -105,6 +105,8 @@ static int hap_parse_decode_instructions(HapContext *ctx, int size)
size_t running_size = 0;
for (i = 0; i < ctx->chunk_count; i++) {
ctx->chunks[i].compressed_offset = running_size;
if (ctx->chunks[i].compressed_size > UINT32_MAX - running_size)
return AVERROR_INVALIDDATA;
running_size += ctx->chunks[i].compressed_size;
}
}
@ -186,7 +188,7 @@ static int hap_parse_frame_header(AVCodecContext *avctx)
HapChunk *chunk = &ctx->chunks[i];
/* Check the compressed buffer is valid */
if (chunk->compressed_offset + chunk->compressed_size > bytestream2_get_bytes_left(gbc))
if (chunk->compressed_offset + (uint64_t)chunk->compressed_size > bytestream2_get_bytes_left(gbc))
return AVERROR_INVALIDDATA;
/* Chunks are unpacked sequentially, ctx->tex_size is the uncompressed