add an extra sanity check for unallocated metadata
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bde8c3c29b
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805bdc6087
4
malloc.c
4
malloc.c
@ -276,6 +276,10 @@ static void *get_slab(struct size_class *c, size_t slab_size, struct slab_metada
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static struct slab_metadata *get_metadata(struct size_class *c, size_t slab_size, void *p) {
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static struct slab_metadata *get_metadata(struct size_class *c, size_t slab_size, void *p) {
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size_t offset = (char *)p - (char *)c->class_region_start;
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size_t offset = (char *)p - (char *)c->class_region_start;
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size_t index = offset / slab_size;
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size_t index = offset / slab_size;
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// still caught without this check either as a read access violation or "double free"
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if (index >= c->metadata_allocated) {
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fatal_error("invalid free within a slab yet to be used");
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}
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return c->slab_info + index;
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return c->slab_info + index;
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}
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}
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