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authorTom Lendacky <thomas.lendacky@amd.com>2022-06-16 18:26:18 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2022-06-24 12:12:29 +0300
commit1b05ece0c931536c0a38a9385e243a7962e933f6 (patch)
tree9298da00b44dfcbdfd5101605a9eb7baa0e0a59f /drivers/crypto
parentbffa1fc065893a14703545efba7d69bb4082b18a (diff)
downloadlinux-1b05ece0c931536c0a38a9385e243a7962e933f6.tar.xz
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: 5441a07a127f ("crypto: ccp - shutdown SEV firmware on kexec") Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/ccp/sev-dev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 0c92d940ac4e..9f588c9728f8 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -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);