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Don't dereference NULL, ensure HashChain fully initialized

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Found by clang's static analyzer, they look validly uninitialized
to me.

Change-Id: I650250f516cdf6081b35cdfe92288c20a3036ac8
This commit is contained in:
Scott Talbot 2014-02-03 18:52:00 +11:00 committed by James Zern
parent 1d1cd3bbd6
commit 391316fee2
2 changed files with 16 additions and 13 deletions
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25
src/enc/backward_references.c
View File

@ -113,11 +113,16 @@ static WEBP_INLINE uint64_t GetPixPairHash64(const uint32_t* const argb) {
return key;
}
static int HashChainInit(HashChain* const p, int size) {
static HashChain* HashChainNew(int size) {
int i;
HashChain* const p = (HashChain*)malloc(sizeof(*p));
if (p == NULL) {
return NULL;
}
p->chain_ = (int*)WebPSafeMalloc((uint64_t)size, sizeof(*p->chain_));
if (p->chain_ == NULL) {
return 0;
free(p);
return NULL;
}
for (i = 0; i < size; ++i) {
p->chain_[i] = -1;
@ -125,7 +130,7 @@ static int HashChainInit(HashChain* const p, int size) {
for (i = 0; i < HASH_SIZE; ++i) {
p->hash_to_first_index_[i] = -1;
}
return 1;
return p;
}
static void HashChainDelete(HashChain* const p) {
@ -278,7 +283,7 @@ static int BackwardReferencesHashChain(int xsize, int ysize,
int cc_init = 0;
const int use_color_cache = (cache_bits > 0);
const int pix_count = xsize * ysize;
HashChain* const hash_chain = (HashChain*)malloc(sizeof(*hash_chain));
HashChain* const hash_chain = HashChainNew(pix_count);
VP8LColorCache hashers;
int window_size = WINDOW_SIZE;
int iter_pos = 1;
@ -290,7 +295,6 @@ static int BackwardReferencesHashChain(int xsize, int ysize,
if (!cc_init) goto Error;
}
if (!HashChainInit(hash_chain, pix_count)) goto Error;
refs->size = 0;
GetParamsForHashChainFindCopy(quality, xsize, cache_bits,
@ -485,7 +489,7 @@ static int BackwardReferencesHashChainDistanceOnly(
float* const cost =
(float*)WebPSafeMalloc((uint64_t)pix_count, sizeof(*cost));
CostModel* cost_model = (CostModel*)malloc(sizeof(*cost_model));
HashChain* hash_chain = (HashChain*)malloc(sizeof(*hash_chain));
HashChain* hash_chain = HashChainNew(pix_count);
VP8LColorCache hashers;
const double mul0 = (recursive_cost_model != 0) ? 1.0 : 0.68;
const double mul1 = (recursive_cost_model != 0) ? 1.0 : 0.82;
@ -496,8 +500,6 @@ static int BackwardReferencesHashChainDistanceOnly(
if (cost == NULL || cost_model == NULL || hash_chain == NULL) goto Error;
if (!HashChainInit(hash_chain, pix_count)) goto Error;
if (use_color_cache) {
cc_init = VP8LColorCacheInit(&hashers, cache_bits);
if (!cc_init) goto Error;
@ -633,12 +635,11 @@ static int BackwardReferencesHashChainFollowChosenPath(
int window_size = WINDOW_SIZE;
int iter_pos = 1;
int iter_limit = -1;
HashChain* hash_chain = (HashChain*)malloc(sizeof(*hash_chain));
HashChain* hash_chain = HashChainNew(pix_count);
VP8LColorCache hashers;
if (hash_chain == NULL || !HashChainInit(hash_chain, pix_count)) {
goto Error;
}
if (hash_chain == NULL) goto Error;
if (use_color_cache) {
cc_init = VP8LColorCacheInit(&hashers, cache_bits);
if (!cc_init) goto Error;

2
src/enc/vp8l.c
View File

@ -959,7 +959,9 @@ static VP8LEncoder* VP8LEncoderNew(const WebPConfig* const config,
}
static void VP8LEncoderDelete(VP8LEncoder* enc) {
if (enc != NULL) {
free(enc->argb_);
}
free(enc);
}