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avcodec/aacpsy: Avoid floating point division by 0 of norm_fac

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Fixes: Ticket7995
Fixes: CVE-2020-20446

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 223b5e8ac9f6461bb13ed365419ec485c5b2b002)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-05-28 20:18:25 +02:00
parent 05cca35df9
commit 5828700d5c
1 changed files with 1 additions and 1 deletions
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libavcodec/aacpsy.c
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@ -794,7 +794,7 @@ static void psy_3gpp_analyze_channel(FFPsyContext *ctx, int channel,
if (pe < 1.15f * desired_pe) { if (pe < 1.15f * desired_pe) {
/* 6.6.1.3.6 "Final threshold modification by linearization" */ /* 6.6.1.3.6 "Final threshold modification by linearization" */
norm_fac = 1.0f / norm_fac; norm_fac = norm_fac ? 1.0f / norm_fac : 0;
for (w = 0; w < wi->num_windows*16; w += 16) { for (w = 0; w < wi->num_windows*16; w += 16) {
for (g = 0; g < num_bands; g++) { for (g = 0; g < num_bands; g++) {
AacPsyBand *band = &pch->band[w+g]; AacPsyBand *band = &pch->band[w+g];