Commit 1b05ece0 authored by Tom Lendacky's avatar Tom Lendacky Committed by Herbert Xu
Browse files

crypto: ccp - During shutdown, check SEV data pointer before using 



On shutdown, each CCP device instance performs shutdown processing.
However, __sev_platform_shutdown_locked() uses the controlling psp
structure to obtain the pointer to the sev_device structure. However,
during driver initialization, it is possible that an error can be received
from the firmware that results in the sev_data pointer being cleared from
the controlling psp structure. The __sev_platform_shutdown_locked()
function does not check for this situation and will segfault.

While not common, this scenario should be accounted for. Add a check for a
NULL sev_device structure before attempting to use it.

Fixes: 5441a07a ("crypto: ccp - shutdown SEV firmware on kexec")
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent bffa1fc0

drivers/crypto/ccp/sev-dev.c

+1 −1
Original line number Diff line number Diff line
@@ -503,7 +503,7 @@ static int __sev_platform_shutdown_locked(int *error) 
	struct sev_device *sev = psp_master->sev_data;

	int ret;



	if (sev->state == SEV_STATE_UNINIT)

	if (!sev || sev->state == SEV_STATE_UNINIT)

		return 0;



	ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);