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riscv: fix locking violation in page fault handler

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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>
This commit is contained in:
Andreas Schwab 2019-05-07 09:36:46 +02:00 • committed by Palmer Dabbelt
parent a967a289f1
commit 8fef9900d4
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1 changed files with 2 additions and 1 deletions
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arch/riscv/mm/fault.c
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@ -229,8 +229,9 @@ vmalloc_fault:
pte_t *pte_k; pte_t *pte_k;
int index; int index;
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) if (user_mode(regs))
goto bad_area; return do_trap(regs, SIGSEGV, code, addr, tsk);
/* /*
* Synchronize this task's top level page-table * Synchronize this task's top level page-table