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calloc: Use calloc() at most places

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This modifies most of the places we do some form of:

  X = malloc(Y * Z);

to use calloc(Y, Z) instead.

Among other issues, this fixes:
  - allocation of integer overflow in grub_png_decode_image_header()
    reported by Chris Coulson,
  - allocation of integer overflow in luks_recover_key()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_lvm_detect()
    reported by Chris Coulson.

Fixes: CVE-2020-14308

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 12:26:01 -04:00 • committed by Daniel Kiper
parent 64e26162eb
commit f725fa7cb2
87 changed files with 179 additions and 178 deletions
Download patch file Download diff file Expand all files Collapse all files

2
grub-core/efiemu/loadcore.c
View file

@ -201,7 +201,7 @@ grub_efiemu_count_symbols (const Elf_Ehdr *e)
grub_efiemu_nelfsyms = (unsigned) s->sh_size / (unsigned) s->sh_entsize;
grub_efiemu_elfsyms = (struct grub_efiemu_elf_sym *)
grub_malloc (sizeof (struct grub_efiemu_elf_sym) * grub_efiemu_nelfsyms);
grub_calloc (grub_efiemu_nelfsyms, sizeof (struct grub_efiemu_elf_sym));
/* Relocators */
for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);

6
grub-core/efiemu/mm.c
View file

@ -554,11 +554,11 @@ grub_efiemu_mmap_sort_and_uniq (void)
/* Initialize variables*/
grub_memset (present, 0, sizeof (int) * GRUB_EFI_MAX_MEMORY_TYPE);
scanline_events = (struct grub_efiemu_mmap_scan *)
grub_malloc (sizeof (struct grub_efiemu_mmap_scan) * 2 * mmap_num);
grub_calloc (mmap_num, sizeof (struct grub_efiemu_mmap_scan) * 2);
/* Number of chunks can't increase more than by factor of 2 */
result = (grub_efi_memory_descriptor_t *)
grub_malloc (sizeof (grub_efi_memory_descriptor_t) * 2 * mmap_num);
grub_calloc (mmap_num, sizeof (grub_efi_memory_descriptor_t) * 2);
if (!result || !scanline_events)
{
grub_free (result);
@ -660,7 +660,7 @@ grub_efiemu_mm_do_alloc (void)
/* Preallocate mmap */
efiemu_mmap = (grub_efi_memory_descriptor_t *)
grub_malloc (mmap_reserved_size * sizeof (grub_efi_memory_descriptor_t));
grub_calloc (mmap_reserved_size, sizeof (grub_efi_memory_descriptor_t));
if (!efiemu_mmap)
{
grub_efiemu_unload ();