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 <firogm@xxxxxxxxx>
---
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
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