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avcodec/flacdec: Fix overflow in multiplication in decode_subframe_fixed()

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Fixes: signed integer overflow: 2 * 1629495328 cannot be represented in type 'int'
Fixes: 4716/clusterfuzz-testcase-minimized-5835915940331520

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3d23f7a096)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-12-26 23:24:44 +01:00
parent c745358efe
commit b9a8b4f279
1 changed files with 1 additions and 1 deletions
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2
libavcodec/flacdec.c
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@ -280,7 +280,7 @@ static int decode_subframe_fixed(FLACContext *s, int32_t *decoded,
if (pred_order > 2)
c = b - decoded[pred_order-2] + decoded[pred_order-3];
if (pred_order > 3)
d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
d = c - decoded[pred_order-2] + 2U*decoded[pred_order-3] - decoded[pred_order-4];
switch (pred_order) {
case 0: