Unverified Commit 8fef9900 authored May 07, 2019 by Andreas Schwab Committed by Palmer Dabbelt May 16, 2019

riscv: fix locking violation in page fault handler



When a user mode process accesses an address in the vmalloc area
do_page_fault tries to unlock the mmap semaphore when it isn't locked.

Signed-off-by: Andreas Schwab <schwab@suse.de>
[Palmer: Duplicated code instead of a goto]
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

parent a967a289

arch/riscv/mm/fault.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -229,8 +229,9 @@ vmalloc_fault:
		pte_t *pte_k;
		int index;

		/* User mode accesses just cause a SIGSEGV */
		if (user_mode(regs))
		goto bad_area;
		return do_trap(regs, SIGSEGV, code, addr, tsk);

		/*
		* Synchronize this task's top level page-table

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