diff options
Diffstat (limited to 'malloc')
| -rw-r--r-- | malloc/malloc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index 32d47f083c..c33709e966 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -2889,6 +2889,7 @@ systrim (size_t pad, mstate av) static void munmap_chunk (mchunkptr p) { + size_t pagesize = GLRO (dl_pagesize); INTERNAL_SIZE_T size = chunksize (p); assert (chunk_is_mmapped (p)); @@ -2898,6 +2899,7 @@ munmap_chunk (mchunkptr p) if (DUMPED_MAIN_ARENA_CHUNK (p)) return; + uintptr_t mem = (uintptr_t) chunk2mem (p); uintptr_t block = (uintptr_t) p - prev_size (p); size_t total_size = prev_size (p) + size; /* Unfortunately we have to do the compilers job by hand here. Normally @@ -2905,7 +2907,8 @@ munmap_chunk (mchunkptr p) page size. But gcc does not recognize the optimization possibility (in the moment at least) so we combine the two values into one before the bit test. */ - if (__builtin_expect (((block | total_size) & (GLRO (dl_pagesize) - 1)) != 0, 0)) + if (__glibc_unlikely ((block | total_size) & (pagesize - 1)) != 0 + || __glibc_unlikely (!powerof2 (mem & (pagesize - 1)))) malloc_printerr ("munmap_chunk(): invalid pointer"); atomic_decrement (&mp_.n_mmaps); |