In this patch, I add error-handing code for kmalloc() in arch/x86/platform/efi/efi_64.c::efi_call_phys_prolog().
If kmalloc() failed to alloc memroy, save_pgd will be a NULL pointer dereferenced by subsequent codes. Signed-off-by: Firo Yang <[email protected]> --- arch/x86/platform/efi/efi_64.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index a0ac0f9..62326c4 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -90,6 +90,8 @@ pgd_t * __init efi_call_phys_prolog(void) n_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT), PGDIR_SIZE); save_pgd = kmalloc(n_pgds * sizeof(pgd_t), GFP_KERNEL); + if (unlikely(!save_pgd)) + return NULL; for (pgd = 0; pgd < n_pgds; pgd++) { save_pgd[pgd] = *pgd_offset_k(pgd * PGDIR_SIZE); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
