6.8-stable review patch. If anyone has any objections, please let me know.
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From: Oleksandr Tymoshenko ovt@google.com
[ Upstream commit 62b71cd73d41ddac6b1760402bbe8c4932e23531 ]
Check if get_next_variable() is actually valid pointer before calling it. In kdump kernel this method is set to NULL that causes panic during the kexec-ed kernel boot.
Tested with QEMU and OVMF firmware.
Fixes: bad267f9e18f ("efi: verify that variable services are supported") Signed-off-by: Oleksandr Tymoshenko ovt@google.com Signed-off-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/efi/efi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 4fcda50acfa4a..1ea14e86a741b 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -203,6 +203,8 @@ static bool generic_ops_supported(void)
name_size = sizeof(name);
+ if (!efi.get_next_variable) + return false; status = efi.get_next_variable(&name_size, &name, &guid); if (status == EFI_UNSUPPORTED) return false;