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This ensures large allocation request stay large and can't be confused with a small allocation. Passes regress, OK for commit? diff --git a/malloc/malloc.c b/malloc/malloc.c index c40b793f4a5d6b3b80e086f47a9ec72ad62b6526..fc55452cca79b6831bdefe9f72759682dc4457d7 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1322,8 +1322,8 @@ nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ /* Check if REQ overflows when padded and aligned and if the resulting value is less than PTRDIFF_T. Returns the requested size or - MINSIZE in case the value is less than MINSIZE, or 0 if any of the - previous checks fail. */ + MINSIZE in case the value is less than MINSIZE, or PTRDIFF_T + 1 if any + of the previous checks fail. */ static __always_inline size_t checked_request2size (size_t req) __nonnull (1) { @@ -1331,7 +1331,7 @@ checked_request2size (size_t req) __nonnull (1) "PTRDIFF_MAX is not more than half of SIZE_MAX"); if (__glibc_unlikely (req > PTRDIFF_MAX)) - return 0; + return (size_t)PTRDIFF_MAX + 1; /* When using tagged memory, we cannot share the end of the user block with the header for the next chunk, so ensure that we @@ -3513,12 +3513,12 @@ __libc_realloc (void *oldmem, size_t bytes) || __builtin_expect (misaligned_chunk (oldp), 0))) malloc_printerr ("realloc(): invalid pointer"); - nb = checked_request2size (bytes); - if (nb == 0) + if (bytes > PTRDIFF_MAX) { __set_errno (ENOMEM); return NULL; } + nb = checked_request2size (bytes); if (chunk_is_mmapped (oldp)) { @@ -3887,12 +3887,12 @@ _int_malloc (mstate av, size_t bytes) aligned. */ - nb = checked_request2size (bytes); - if (nb == 0) + if (bytes > PTRDIFF_MAX) { __set_errno (ENOMEM); return NULL; } + nb = checked_request2size (bytes); /* There are no usable arenas. Fall back to sysmalloc to get a chunk from mmap. */ @@ -5047,12 +5047,12 @@ _int_memalign (mstate av, size_t alignment, size_t bytes) unsigned long remainder_size; /* its size */ INTERNAL_SIZE_T size; - nb = checked_request2size (bytes); - if (nb == 0) + if (bytes > PTRDIFF_MAX) { __set_errno (ENOMEM); return NULL; } + nb = checked_request2size (bytes); /* We can't check tcache here because we hold the arena lock, which tcache doesn't expect. We expect it has been checked