avcodec/jpegls: Check A[Q] for overflow in ff_jpegls_update_state_regular()

Fixes: Timeout Fixes: 30912/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MJPEG_fuzzer-5556235476795392

Michael Niedermayer committed 5 years ago

Commit 8a3fea81 parent 337984c1 file · +1 −1Browse files

Unified · Split

@@ -95,7 +95,7 @@ static inline void ff_jpegls_downscale_state(JLSState *state, int Q) · 94 unmodified lines
95	static inline int ff_jpegls_update_state_regular(JLSState *state,	95	static inline int ff_jpegls_update_state_regular(JLSState *state,
96	int Q, int err)	96	int Q, int err)
97	{	97	{
98	if(FFABS(err) > 0xFFFF)	98	if(FFABS(err) > 0xFFFF \|\| FFABS(err) > INT_MAX - state->A[Q])
99	return -0x10000;	99	return -0x10000;
100	state->A[Q] += FFABS(err);	100	state->A[Q] += FFABS(err);
101	err *= state->twonear;	101	err *= state->twonear;

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