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avcodec/jpeg2000dec: Check bpno in decode_cblk()

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Fixes: undefined shift
Fixes: c409ef86f892335a0a164b5871174d5a/asan_heap-oob_1dff564_2159_162b7234616deab02b544410455eb07b.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-04 16:23:24 +01:00
parent 5d2cc00dd0
commit a85b02dcf7
1 changed files with 4 additions and 0 deletions
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4
libavcodec/jpeg2000dec.c
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@ -1493,6 +1493,10 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
ff_mqc_initdec(&t1->mqc, cblk->data, 0, 1);
while (passno--) {
if (bpno < 0) {
av_log(s->avctx, AV_LOG_ERROR, "bpno became negative\n");
return AVERROR_INVALIDDATA;
}
switch(pass_t) {
case 0:
decode_sigpass(t1, width, height, bpno + 1, bandpos,