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stb_image: fixed 'out' nulled but not freed upon failure

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If realloc fails it returns NULL and out pointer becomes invalid. To
fix this it is necessary to store realloc return value in temporary
pointer and then compare it with NULL. If it equals NULL then return
error and source pointer will still valid.

This error was caught by cppcheck:
Common realloc mistake: 'out' nulled but not freed upon failure.
This commit is contained in:
Georgy Macharadze 2019-04-22 14:06:05 +03:00
parent 72990efc3e
commit 4e0c494515
1 changed files with 9 additions and 1 deletions
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10
stb_image.h
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@ -6589,7 +6589,15 @@ static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y,
stride = g.w * g.h * 4;
if (out) {
out = (stbi_uc*) STBI_REALLOC( out, layers * stride );
void *tmp = (stbi_uc*) STBI_REALLOC( out, layers * stride );
if (NULL == tmp) {
STBI_FREE(g.out);
STBI_FREE(g.history);
STBI_FREE(g.background);
return stbi__errpuc("outofmem", "Out of memory");
}
else
out = tmp;
if (delays) {
*delays = (int*) STBI_REALLOC( *delays, sizeof(int) * layers );
}