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avcodec/aac/aacdec_usac: Test ac in usac

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ff_aac_usac_config_decode() needs AACDecContext to be set but some callers
pass NULL.

Happens only when the LATM decoder is used, and USAC is not supported in
LATM

Fixes: member access within null pointer of type 'AACDecContext' (aka 'struct AACDecContext')
Fixes: 69435/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_LATM_fuzzer-5733527483121664

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-06-23 20:20:37 +02:00
parent c221c7422f
commit 1080116658
No known key found for this signature in database
GPG Key ID: B18E8928B3948D64
1 changed files with 3 additions and 0 deletions
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libavcodec/aac/aacdec_usac.c
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@ -348,6 +348,9 @@ int ff_aac_usac_config_decode(AACDecContext *ac, AVCodecContext *avctx,
int map_pos_set = 0;
uint8_t layout_map[MAX_ELEM_ID*4][3] = { 0 };
if (!ac)
return AVERROR_PATCHWELCOME;
memset(usac, 0, sizeof(*usac));
freq_idx = get_bits(gb, 5); /* usacSamplingFrequencyIndex */