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calloc: Make sure we always have an overflow-checking calloc() available

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This tries to make sure that everywhere in this source tree, we always have
an appropriate version of calloc() (i.e. grub_calloc(), xcalloc(), etc.)
available, and that they all safely check for overflow and return NULL when
it would occur.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Peter Jones 2020-06-15 12:15:29 -04:00 • committed by Daniel Kiper
parent 68708c4503
commit 64e26162eb
7 changed files with 85 additions and 3 deletions
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8
grub-core/lib/posix_wrap/stdlib.h
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@ -21,6 +21,7 @@
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/safemath.h>
static inline void
free (void *ptr)
@ -37,7 +38,12 @@ malloc (grub_size_t size)
static inline void *
calloc (grub_size_t size, grub_size_t nelem)
{
return grub_zalloc (size * nelem);
grub_size_t sz;
if (grub_mul (size, nelem, &sz))
return NULL;
return grub_zalloc (sz);
}
static inline void *