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vp6: Fix illegal read.

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Found with Address Sanitizer

Signed-off-by: Alex Converse <alex.converse@gmail.com>
(cherry picked from commit e0966eb140b3569b3d6b5b5008961944ef229c06)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
(cherry picked from commit ba4b08b78918f399f9c9524750b26e904d146078)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Thierry Foucu 2011-11-17 09:39:52 -08:00 committed by Reinhard Tartler
parent 8d68083298
commit 94aacaf508
1 changed files with 6 additions and 3 deletions
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9
libavcodec/vp6.c
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@ -439,7 +439,8 @@ static void vp6_parse_coeff(VP56Context *s)
model1 = model->coeff_dccv[pt];
model2 = model->coeff_dcct[pt][ctx];
for (coeff_idx=0; coeff_idx<64; ) {
coeff_idx = 0;
for (;;) {
if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
/* parse a coeff */
if (vp56_rac_get_prob(c, model2[2])) {
@ -480,8 +481,10 @@ static void vp6_parse_coeff(VP56Context *s)
run += vp56_rac_get_prob(c, model3[i+8]) << i;
}
}
cg = vp6_coeff_groups[coeff_idx+=run];
coeff_idx += run;
if (coeff_idx >= 64)
break;
cg = vp6_coeff_groups[coeff_idx];
model1 = model2 = model->coeff_ract[pt][ct][cg];
}