From: Eugeniy Paltsev Date: Wed, 7 Nov 2018 12:12:49 +0000 (+0300) Subject: ARC: mm: fix uninitialised signal code in do_page_fault X-Git-Tag: v4.19.73~57 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7edfa9c99d215db6ef5df1038de5b36bcfa1bb63;p=platform%2Fkernel%2Flinux-rpi.git ARC: mm: fix uninitialised signal code in do_page_fault [ Upstream commit 121e38e5acdc8e1e4cdb750fcdcc72f94e420968 ] Commit 15773ae938d8 ("signal/arc: Use force_sig_fault where appropriate") introduced undefined behaviour by leaving si_code unitiailized and leaking random kernel values to user space. Fixes: 15773ae938d8 ("signal/arc: Use force_sig_fault where appropriate") Signed-off-by: Eugeniy Paltsev Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin --- diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c index a0366f9d..535cf18 100644 --- a/arch/arc/mm/fault.c +++ b/arch/arc/mm/fault.c @@ -66,7 +66,7 @@ void do_page_fault(unsigned long address, struct pt_regs *regs) struct vm_area_struct *vma = NULL; struct task_struct *tsk = current; struct mm_struct *mm = tsk->mm; - int si_code; + int si_code = 0; int ret; vm_fault_t fault; int write = regs->ecr_cause & ECR_C_PROTV_STORE; /* ST/EX */