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avcodec/aacsbr_template: Check ilb

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Fixes: index 50 out of bounds for type 'INTFLOAT [40][2]'
Fixes: 401661737/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_LATM_fuzzer-4866055713652736

Someone knowing AAC well should review this, there is likely a nicer fix

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-05-11 00:58:26 +02:00
parent 069daca9e0
commit 01a1b99fc2
1 changed files with 6 additions and 0 deletions
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6
libavcodec/aacsbr_template.c
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@@ -1626,6 +1626,9 @@ static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2]
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
if (ilb >= 40)
return;
for (m = 0; m < sbr->m[1]; m++) {
AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
#if USE_FIXED
@@ -1644,6 +1647,9 @@ static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2]
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
if (ilb >= 40)
return;
for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
#if USE_FIXED
SoftFloat sum = FLOAT_0;