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crypto: ccp - During shutdown, check SEV data pointer before using
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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: 5441a07 ("crypto: ccp - shutdown SEV firmware on kexec")
Signed-off-by: Tom Lendacky <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
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tlendacky authored and herbertx committed Jun 24, 2022
1 parent bffa1fc commit 1b05ece

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