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Batch #3 of EFI fixes for v6.2

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- handle potential mremap() failure gracefully
 
 - don't reject EFI memory attributes table version 2
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Merge tag 'efi-fixes-for-v6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI fixes from Ard Biesheuvel:

 - handle potential mremap() failure gracefully

 - don't reject EFI memory attributes table version 2

* tag 'efi-fixes-for-v6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
  efi: fix potential NULL deref in efi_mem_reserve_persistent
  efi: Accept version 2 of memory attributes table
This commit is contained in:
Linus Torvalds 2023-02-03 10:25:41 -08:00
commit a0880c3379
2 changed files with 3 additions and 1 deletions
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2
drivers/firmware/efi/efi.c
View file

@ -1007,6 +1007,8 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
/* first try to find a slot in an existing linked list entry */
for (prsv = efi_memreserve_root->next; prsv; ) {
rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB);
if (!rsv)
return -ENOMEM;
index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size);
if (index < rsv->size) {
rsv->entry[index].base = addr;

2
drivers/firmware/efi/memattr.c
View file

@ -33,7 +33,7 @@ int __init efi_memattr_init(void)
return -ENOMEM;
}
if (tbl->version > 1) {
if (tbl->version > 2) {
pr_warn("Unexpected EFI Memory Attributes table version %d\n",
tbl->version);
goto unmap;