powerpc: Skip stack validation checking alternate stacks if they are not allocated

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Stack validation in early boot can just bail out of checking alternate
stacks if they are not validated yet. Checking against a NULL stack
could cause NULLish pointer values to be considered valid.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221216115930.2667772-5-npiggin@gmail.com

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Nicholas Piggin 2022-12-16 21:59:30 +10:00 • committed by Michael Ellerman

parent dc222fa773

commit 1ee4e35076

1 changed files with 11 additions and 0 deletions

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arch/powerpc/kernel/process.c

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