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malloc: Simplify checked_request2size interface

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In-band signaling avoids an uninitialized variable warning when
building with -Og and GCC 12.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
2022-07-05 11:04:45 +02:00
parent ef0700004b
commit 7519dee356
2 changed files with 18 additions and 15 deletions
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3
malloc/malloc-check.c
View File

@ -275,7 +275,8 @@ realloc_check (void *oldmem, size_t bytes)
malloc_printerr ("realloc(): invalid pointer"); malloc_printerr ("realloc(): invalid pointer");
const INTERNAL_SIZE_T oldsize = chunksize (oldp); const INTERNAL_SIZE_T oldsize = chunksize (oldp);
if (!checked_request2size (rb, &chnb)) chnb = checked_request2size (rb);
if (chnb == 0)
{ {
__set_errno (ENOMEM); __set_errno (ENOMEM);
goto invert; goto invert;

30
malloc/malloc.c
View File

@ -1333,15 +1333,15 @@ nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
MINSIZE : \ MINSIZE : \
((req) + SIZE_SZ + MALLOC_ALIGN_MASK) & ~MALLOC_ALIGN_MASK) ((req) + SIZE_SZ + MALLOC_ALIGN_MASK) & ~MALLOC_ALIGN_MASK)
/* Check if REQ overflows when padded and aligned and if the resulting value /* Check if REQ overflows when padded and aligned and if the resulting
is less than PTRDIFF_T. Returns TRUE and the requested size or MINSIZE in value is less than PTRDIFF_T. Returns the requested size or
case the value is less than MINSIZE on SZ or false if any of the previous MINSIZE in case the value is less than MINSIZE, or 0 if any of the
check fail. */ previous checks fail. */
static inline bool static inline size_t
checked_request2size (size_t req, size_t *sz) __nonnull (1) checked_request2size (size_t req) __nonnull (1)
{ {
if (__glibc_unlikely (req > PTRDIFF_MAX)) if (__glibc_unlikely (req > PTRDIFF_MAX))
return false; return 0;
/* When using tagged memory, we cannot share the end of the user /* When using tagged memory, we cannot share the end of the user
block with the header for the next chunk, so ensure that we block with the header for the next chunk, so ensure that we
@ -1359,8 +1359,7 @@ checked_request2size (size_t req, size_t *sz) __nonnull (1)
~(size_t)(__MTAG_GRANULE_SIZE - 1); ~(size_t)(__MTAG_GRANULE_SIZE - 1);
} }
*sz = request2size (req); return request2size (req);
return true;
} }
/* /*
@ -3295,8 +3294,8 @@ __libc_malloc (size_t bytes)
ptmalloc_init (); ptmalloc_init ();
#if USE_TCACHE #if USE_TCACHE
/* int_free also calls request2size, be careful to not pad twice. */ /* int_free also calls request2size, be careful to not pad twice. */
size_t tbytes; size_t tbytes = checked_request2size (bytes);
if (!checked_request2size (bytes, &tbytes)) if (tbytes == 0)
{ {
__set_errno (ENOMEM); __set_errno (ENOMEM);
return NULL; return NULL;
@ -3443,7 +3442,8 @@ __libc_realloc (void *oldmem, size_t bytes)
|| __builtin_expect (misaligned_chunk (oldp), 0))) || __builtin_expect (misaligned_chunk (oldp), 0)))
malloc_printerr ("realloc(): invalid pointer"); malloc_printerr ("realloc(): invalid pointer");
if (!checked_request2size (bytes, &nb)) nb = checked_request2size (bytes);
if (nb == 0)
{ {
__set_errno (ENOMEM); __set_errno (ENOMEM);
return NULL; return NULL;
@ -3800,7 +3800,8 @@ _int_malloc (mstate av, size_t bytes)
aligned. aligned.
*/ */
if (!checked_request2size (bytes, &nb)) nb = checked_request2size (bytes);
if (nb == 0)
{ {
__set_errno (ENOMEM); __set_errno (ENOMEM);
return NULL; return NULL;
@ -4952,7 +4953,8 @@ _int_memalign (mstate av, size_t alignment, size_t bytes)
if (!checked_request2size (bytes, &nb)) nb = checked_request2size (bytes);
if (nb == 0)
{ {
__set_errno (ENOMEM); __set_errno (ENOMEM);
return NULL; return NULL;