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BackwardReferencesHashChainDistanceOnly: fix segfault on OOM

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change CostManager to calloc to avoid frees on undefined pointer
values in CostManagerClear() should the cost_model allocation succeed,
but the cost_manager allocation fail

since:
v0.5.0-93-g3e023c17 Speed-up BackwardReferencesHashChainDistanceOnly.

Tested:
for i in `seq 1 639`; do
  export MALLOC_FAIL_AT=$i
  ./examples/cwebp -m 6 -q 100 -lossless jpeg_file
done

Bug: webp:565
Change-Id: I376d81e6f41eb73529053e9e30c142b4b4f6b45b
(cherry picked from commit a828a59b49)
(cherry picked from commit dd80bb4343)
(cherry picked from commit 4d0964cd0c)
This commit is contained in:
James Zern 2022-04-04 10:44:06 -07:00
parent c0299b779c
commit 91cc4e377f
1 changed files with 1 additions and 1 deletions
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2
src/enc/backward_references_cost_enc.c
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@ -577,7 +577,7 @@ static int BackwardReferencesHashChainDistanceOnly(
(CostModel*)WebPSafeCalloc(1ULL, cost_model_size); (CostModel*)WebPSafeCalloc(1ULL, cost_model_size);
VP8LColorCache hashers; VP8LColorCache hashers;
CostManager* cost_manager = CostManager* cost_manager =
(CostManager*)WebPSafeMalloc(1ULL, sizeof(*cost_manager)); (CostManager*)WebPSafeCalloc(1ULL, sizeof(*cost_manager));
int offset_prev = -1, len_prev = -1; int offset_prev = -1, len_prev = -1;
double offset_cost = -1; double offset_cost = -1;
int first_offset_is_constant = -1; // initialized with 'impossible' value int first_offset_is_constant = -1; // initialized with 'impossible' value