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Merge pull request #309 from google/eustas-fix-possible-underflow

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Fix possible pointer underflow
This commit is contained in:
eustas 2016-02-04 17:38:44 +01:00
commit 33aa40220b
1 changed files with 4 additions and 0 deletions
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dec/decode.c
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@ -1717,6 +1717,10 @@ postReadDistance:
uint8_t* copy_src = &s->ringbuffer[
(pos - s->distance_code) & s->ringbuffer_mask];
uint8_t* copy_dst = &s->ringbuffer[pos];
/* Check for possible underflow and clamp the pointer to 0. */
if (PREDICT_FALSE(s->ringbuffer_end < (const uint8_t*)0 + i)) {
ringbuffer_end_minus_copy_length = 0;
}
/* update the recent distances cache */
s->dist_rb[s->dist_rb_idx & 3] = s->distance_code;
++s->dist_rb_idx;