linux-kernel - [PATCH 10/10] powerpc/signal32: Simplify logging in sigreturn()

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Date:   Fri, 19 Mar 2021 11:07:00 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, cmr@...efail.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 10/10] powerpc/signal32: Simplify logging in sigreturn()

Same spirit as commit debf122c777f ("powerpc/signal32: Simplify logging
in handle_rt_signal32()"), remove this intermediate 'addr' local var.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/signal_32.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 592b889e3836..5be267b3a13e 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1352,7 +1352,6 @@ SYSCALL_DEFINE0(sigreturn)
 	struct sigcontext __user *sc;
 	struct sigcontext sigctx;
 	struct mcontext __user *sr;
-	void __user *addr;
 	sigset_t set;
 	struct mcontext __user *mcp;
 	struct mcontext __user *tm_mcp = NULL;
@@ -1363,7 +1362,6 @@ SYSCALL_DEFINE0(sigreturn)
 
 	sf = (struct sigframe __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
 	sc = &sf->sctx;
-	addr = sc;
 	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
 		goto badframe;
 
@@ -1392,16 +1390,19 @@ SYSCALL_DEFINE0(sigreturn)
 			goto badframe;
 	} else {
 		sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
-		addr = sr;
-		if (restore_user_regs(regs, sr, 1))
-			goto badframe;
+		if (restore_user_regs(regs, sr, 1)) {
+			signal_fault(current, regs, "sys_sigreturn", sr);
+
+			force_sig(SIGSEGV);
+			return 0;
+		}
 	}
 
 	set_thread_flag(TIF_RESTOREALL);
 	return 0;
 
 badframe:
-	signal_fault(current, regs, "sys_sigreturn", addr);
+	signal_fault(current, regs, "sys_sigreturn", sc);
 
 	force_sig(SIGSEGV);
 	return 0;
-- 
2.25.0