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

30
malloc/malloc.c
View File

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