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avcodec/diracdec: Tighter checks on CODEBLOCKS_X/Y 

Fixes very long but finite loop
Fixes: asan_heap-oob_107866c_42_041.drc
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5145d22b88)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-28 01:23:40 +01:00
parent 917946e1c9
commit 824f29e4fb
1 changed files with 2 additions and 2 deletions
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4
libavcodec/diracdec.c
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@ -1007,8 +1007,8 @@ static int dirac_unpack_idwt_params(DiracContext *s)
/* Codeblock parameters (core syntax only) */
if (get_bits1(gb)) {
for (i = 0; i <= s->wavelet_depth; i++) {
CHECKEDREAD(s->codeblock[i].width , tmp < 1, "codeblock width invalid\n")
CHECKEDREAD(s->codeblock[i].height, tmp < 1, "codeblock height invalid\n")
CHECKEDREAD(s->codeblock[i].width , tmp < 1 || tmp > (s->avctx->width >>s->wavelet_depth-i), "codeblock width invalid\n")
CHECKEDREAD(s->codeblock[i].height, tmp < 1 || tmp > (s->avctx->height>>s->wavelet_depth-i), "codeblock height invalid\n")
}
CHECKEDREAD(s->codeblock_mode, tmp > 1, "unknown codeblock mode\n")