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![Jiang Biao](https://secure.gravatar.com/avatar/49228e6647089e99ee054a90127fd13d.jpg?s=96&d=mm)
Jiang Biao committed 36d6a43a16e
x86/pti: Check the return value of pti_user_pagetable_walk_p4d() [ Upstream commit b2b7d986a89b6c94b1331a909de1217214fb08c1 ] pti_user_pagetable_walk_p4d() can return NULL, so the return value should be checked to prevent a NULL pointer dereference. Add the check and a warning when the P4D 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/1532045192-49622-1-git-send-email-jiang.biao2@zte.com.cn Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>