From: Sven Schnelle <svens@stackframe.org>
Date: Thu, 30 Sep 2021 17:26:03 +0000 (+0200)
Subject: parisc/unwind: use copy_from_kernel_nofault()
X-Git-Tag: v6.1-rc5~2791^2~35
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cf2ec7893f876f4c30aed8a76bb4ebacdce74dd3;p=platform%2Fkernel%2Flinux-starfive.git

parisc/unwind: use copy_from_kernel_nofault()

I have no idea why get_user() is used there, but we're unwinding the
kernel stack, so we should use copy_from_kernel_nofault().

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/arch/parisc/kernel/unwind.c b/arch/parisc/kernel/unwind.c
index 87ae476..889d588 100644
--- a/arch/parisc/kernel/unwind.c
+++ b/arch/parisc/kernel/unwind.c
@@ -302,7 +302,8 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
 				break;
 			}
 
-			if (get_user(tmp, (unsigned long *)(info->prev_sp - RP_OFFSET))) 
+			if (copy_from_kernel_nofault(&tmp,
+			    (void *)info->prev_sp - RP_OFFSET, sizeof(tmp)))
 				break;
 			info->prev_ip = tmp;
 			sp = info->prev_sp;