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GetBackwardReferences: fail on alloc error

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previously failures in the call to
VP8LBackwardReferencesTraceBackwards() would be ignored which, though it
wouldn't result in a crash, would produce non-deterministic output

Change-Id: Id9890a60883c3270ec75e968506d46eea32b76d4
(cherry picked from commit e3cfafaf71)
(cherry picked from commit 20ef03ee35)
This commit is contained in:
James Zern 2022-04-04 10:47:40 -07:00
parent 0bc4bb021f
commit 67bc8b1c3e
1 changed files with 10 additions and 9 deletions
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7
src/enc/backward_references_enc.c
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@ -976,17 +976,18 @@ static int GetBackwardReferences(int width, int height,
const VP8LHashChain* const hash_chain_tmp = const VP8LHashChain* const hash_chain_tmp =
(lz77_types_best[i] == kLZ77Standard) ? hash_chain : &hash_chain_box; (lz77_types_best[i] == kLZ77Standard) ? hash_chain : &hash_chain_box;
const int cache_bits = (i == 1) ? 0 : *cache_bits_best; const int cache_bits = (i == 1) ? 0 : *cache_bits_best;
if (VP8LBackwardReferencesTraceBackwards(width, height, argb, cache_bits, double bit_cost_trace;
if (!VP8LBackwardReferencesTraceBackwards(width, height, argb, cache_bits,
hash_chain_tmp, &refs[i], hash_chain_tmp, &refs[i],
refs_tmp)) { refs_tmp)) {
double bit_cost_trace; goto Error;
}
VP8LHistogramCreate(histo, refs_tmp, cache_bits); VP8LHistogramCreate(histo, refs_tmp, cache_bits);
bit_cost_trace = VP8LHistogramEstimateBits(histo); bit_cost_trace = VP8LHistogramEstimateBits(histo);
if (bit_cost_trace < bit_costs_best[i]) { if (bit_cost_trace < bit_costs_best[i]) {
BackwardRefsSwap(refs_tmp, &refs[i]); BackwardRefsSwap(refs_tmp, &refs[i]);
} }
} }
}
BackwardReferences2DLocality(width, &refs[i]); BackwardReferences2DLocality(width, &refs[i]);