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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2022-06-16 18:26:18 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-06-24 12:12:29 +0300 |
| commit | 1b05ece0c931536c0a38a9385e243a7962e933f6 (patch) | |
| tree | 9298da00b44dfcbdfd5101605a9eb7baa0e0a59f /drivers/crypto | |
| parent | bffa1fc065893a14703545efba7d69bb4082b18a (diff) | |
| download | linux-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.c | 2 |
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); |