s390/uaccess: add missing EX_TABLE entries to __clear_user()

[ Upstream commit 4e1b5a8 ]

For some exception types the instruction address points behind the
instruction that caused the exception. Take that into account and add
the missing exception table entries.

Cc: <stable@vger.kernel.org>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

arch/s390/lib/uaccess.c

@@ -212,7 +212,7 @@ static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size
 	asm volatile(
 		"   llilh 0,%[spec]\n"
 		"0: .insn ss,0xc80000000000,0(%0,%1),0(%4),0\n"
-		"   jz	  4f\n"
+		"6: jz	  4f\n"
 		"1: algr  %0,%2\n"
 		"   slgr  %1,%2\n"
 		"   j	  0b\n"
@@ -222,11 +222,11 @@ static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size
 		"   clgr  %0,%3\n"	/* copy crosses next page boundary? */
 		"   jnh	  5f\n"
 		"3: .insn ss,0xc80000000000,0(%3,%1),0(%4),0\n"
-		"   slgr  %0,%3\n"
+		"7: slgr  %0,%3\n"
 		"   j	  5f\n"
 		"4: slgr  %0,%0\n"
 		"5:\n"
-		EX_TABLE(0b,2b) EX_TABLE(3b,5b)
+		EX_TABLE(0b,2b) EX_TABLE(6b,2b) EX_TABLE(3b,5b) EX_TABLE(7b,5b)
 		: "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
 		: "a" (empty_zero_page), [spec] "K" (0x81UL)
 		: "cc", "memory", "0");