Fix the real allocation size in OpenBSD rallocx shim

In the rallocx() shim for OpenBSD (that's the only platform that doesn't
have malloc_size() or malloc_usable_size() equivalent), the newly
allocated size was missing the extra size_t member for storing the
allocation size leading to size_t sized overflow at the end of the
reallocated memory chunk.

diff --git a/lib/isc/jemalloc_shim.h b/lib/isc/jemalloc_shim.h
index 11f809966144fede5496f7442e36b1f141d1ee0b..d04ac22ac3e961c86750b417072af103adec8a84 100644 (file)
--- a/lib/isc/jemalloc_shim.h
+++ b/lib/isc/jemalloc_shim.h
@@ -106,7 +106,7 @@ static inline void *
 rallocx(void *ptr, size_t size, int flags) {
        UNUSED(flags);
 
-       size_t *__ptr = realloc(&((size_t *)ptr)[-1], size);
+       size_t *__ptr = realloc(&((size_t *)ptr)[-1], size + sizeof(size_t));
        REQUIRE(__ptr != NULL);
        __ptr[0] = size;