x86/pti: Check the return value of pti_user_pagetable_walk_pmd()

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pti_user_pagetable_walk_pmd() can return NULL, so the return value should
be checked to prevent a NULL pointer dereference.

Add the check and a warning when the PMD allocation fails.

Signed-off-by: Jiang Biao <jiang.biao2@zte.com.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@linux.intel.com
Cc: luto@kernel.org
Cc: hpa@zytor.com
Cc: albcamus@gmail.com
Cc: zhong.weidong@zte.com.cn
Link: https://lkml.kernel.org/r/1532045192-49622-2-git-send-email-jiang.biao2@zte.com.cn

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Jiang Biao 2018-07-20 08:06:32 +08:00 • committed by Thomas Gleixner

parent b2b7d986a8

commit 8c934e01a7

1 changed files with 7 additions and 3 deletions

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arch/x86/mm/pti.c

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