[patch 2/2] s390: bug in setup_rt_frame

[Heiko Carstens]

From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

Consider return value of __put_user() when setting up a signal frame instead
of ignoring it.

Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---

Second version of this patch. This time without replacing __NR_rt_sigreturn
with __NR_sigreturn...

 arch/s390/kernel/signal.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
index ae1927e..d48cfc7 100644
--- a/arch/s390/kernel/signal.c
+++ b/arch/s390/kernel/signal.c
@@ -358,8 +358,9 @@ static int setup_rt_frame(int sig, struc
 	} else {
                 regs->gprs[14] = (unsigned long)
 			frame->retcode | PSW_ADDR_AMODE;
-		err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
-	                          (u16 __user *)(frame->retcode));
+		if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
+			       (u16 __user *)(frame->retcode)))
+			goto give_sigsegv;
 	}
 
 	/* Set up backchain. */
-
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