[FFmpeg-devel] [PATCH 2/3] avcodec/aacpsy: Avoid floating point division by 0 of norm_fac

[Michael Niedermayer]

Fixes: Ticket7995
Fixes: CVE-2020-20446

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/aacpsy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/aacpsy.c b/libavcodec/aacpsy.c
index 482113d427..e51d29750b 100644
--- a/libavcodec/aacpsy.c
+++ b/libavcodec/aacpsy.c
@@ -794,7 +794,7 @@ static void psy_3gpp_analyze_channel(FFPsyContext *ctx, int channel,
 
         if (pe < 1.15f * desired_pe) {
             /* 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 (g = 0; g < num_bands; g++) {
                     AacPsyBand *band = &pch->band[w+g];
-- 
2.17.1