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interplayacm: check for too large b 

This fixes out-of-bounds reads.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-10-30 20:47:22 +01:00
parent 2d99101d09
commit 14e4e26559
1 changed files with 12 additions and 0 deletions
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12
libavcodec/interplayacm.c
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@ -326,6 +326,10 @@ static int t15(InterplayACMContext *s, unsigned ind, unsigned col)
for (i = 0; i < s->rows; i++) {
/* b = (x1) + (x2 * 3) + (x3 * 9) */
b = get_bits(gb, 5);
if (b > 26) {
av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 26\n", b);
return AVERROR_INVALIDDATA;
}
n1 = (mul_3x3[b] & 0x0F) - 1;
n2 = ((mul_3x3[b] >> 4) & 0x0F) - 1;
@ -351,6 +355,10 @@ static int t27(InterplayACMContext *s, unsigned ind, unsigned col)
for (i = 0; i < s->rows; i++) {
/* b = (x1) + (x2 * 5) + (x3 * 25) */
b = get_bits(gb, 7);
if (b > 124) {
av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 124\n", b);
return AVERROR_INVALIDDATA;
}
n1 = (mul_3x5[b] & 0x0F) - 2;
n2 = ((mul_3x5[b] >> 4) & 0x0F) - 2;
@ -375,6 +383,10 @@ static int t37(InterplayACMContext *s, unsigned ind, unsigned col)
for (i = 0; i < s->rows; i++) {
/* b = (x1) + (x2 * 11) */
b = get_bits(gb, 7);
if (b > 120) {
av_log(NULL, AV_LOG_ERROR, "Too large b = %d > 120\n", b);
return AVERROR_INVALIDDATA;
}
n1 = (mul_2x11[b] & 0x0F) - 5;
n2 = ((mul_2x11[b] >> 4) & 0x0F) - 5;