Commit be36f9e7517e ("efi: READ_ONCE rng seed size before munmap") added a READ_ONCE() and also changed the call to add_bootloader_randomness() to use the local size variable. Neither of these changes was actually needed and this was not backported to the 4.19 stable branch.
Commit 161a438d730d ("efi: random: reduce seed size to 32 bytes") reverted the addition of READ_ONCE() and added a limit to the value of size. This depends on the earlier commit, because size can now differ from seed->size, but it was wrongly backported to the 4.19 stable branch by itself.
Apply the missing change to the add_bootloader_randomness() parameter (except that here we are still using add_device_randomness()).
Fixes: 0513592520ae ("efi: random: reduce seed size to 32 bytes") Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/firmware/efi/efi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index f0ef2643b70e..2bbc2289fe09 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -566,7 +566,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, sizeof(*seed) + size); if (seed != NULL) { pr_notice("seeding entropy pool\n"); - add_device_randomness(seed->bits, seed->size); + add_device_randomness(seed->bits, size); early_memunmap(seed, sizeof(*seed) + size); } else { pr_err("Could not map UEFI random seed!\n");