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efi: fix panic in kdump kernel

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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: bad267f9e1 ("efi: verify that variable services are supported")
Signed-off-by: Oleksandr Tymoshenko <ovt@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Oleksandr Tymoshenko
2024-03-23 06:33:33 +00:00
committed by Ard Biesheuvel
parent df7ecce842
commit 62b71cd73d
1 changed files with 2 additions and 0 deletions
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drivers/firmware/efi/efi.c
+2
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@@ -203,6 +203,8 @@ static bool generic_ops_supported(void)
name_size = sizeof(name); name_size = sizeof(name);
if (!efi.get_next_variable)
return false;
status = efi.get_next_variable(&name_size, &name, &guid); status = efi.get_next_variable(&name_size, &name, &guid);
if (status == EFI_UNSUPPORTED) if (status == EFI_UNSUPPORTED)
return false; return false;