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avcodec/truemotion2: Fix several integer overflows in tm2_update_block()

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Fixes: signed integer overflow: -1877966852 + -469491713 cannot be represented in type 'int'
Fixes: 14561/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5167608359288832

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 8eecf761a65baf4ce6f25c0a149819cc9414c0f0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-05-05 00:31:24 +02:00
parent fa0caf43c4
commit 805e692303
1 changed files with 5 additions and 5 deletions
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10
libavcodec/truemotion2.c
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@ -680,15 +680,15 @@ static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int b
TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
/* update deltas */
ctx->D[0] = Yo[3] - last[3];
ctx->D[1] = Yo[3 + oYstride] - Yo[3];
ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
ctx->D[0] = (unsigned)Yo[3] - last[3];
ctx->D[1] = (unsigned)Yo[3 + oYstride] - Yo[3];
ctx->D[2] = (unsigned)Yo[3 + oYstride * 2] - Yo[3 + oYstride];
ctx->D[3] = (unsigned)Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
for (j = 0; j < 4; j++) {
d = last[3];
for (i = 0; i < 4; i++) {
Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
Y[i] = Yo[i] + (unsigned)GET_TOK(ctx, TM2_UPD);
last[i] = Y[i];
}
ctx->D[j] = last[3] - d;