This is a note to let you know that I've just added the patch titled
efi: fix panic in kdump kernel
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
efi-fix-panic-in-kdump-kernel.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 114f71a9355e230c07a9dcc90c92044e3e98a73d
Author: Oleksandr Tymoshenko <ovt@xxxxxxxxxx>
Date: Sat Mar 23 06:33:33 2024 +0000
efi: fix panic in kdump kernel
[ 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@xxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 1974f0ad32bad..2c1095dcc2f2f 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -199,6 +199,8 @@ 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;
