kprobes: fix error checking of batch registration

Fix error checking routine to catch an error which occurs in first
__register_*probe().
Signed-off-by: NMasami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: David Miller <davem@davemloft.net>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/kprobes.c

@@ -699,8 +699,9 @@ static int __register_kprobes(struct kprobe **kps, int num,
 		return -EINVAL;
 	for (i = 0; i < num; i++) {
 		ret = __register_kprobe(kps[i], called_from);
-		if (ret < 0 && i > 0) {
-			unregister_kprobes(kps, i);
+		if (ret < 0) {
+			if (i > 0)
+				unregister_kprobes(kps, i);
 			break;
 		}
 	}
@@ -776,8 +777,9 @@ static int __register_jprobes(struct jprobe **jps, int num,
 			jp->kp.break_handler = longjmp_break_handler;
 			ret = __register_kprobe(&jp->kp, called_from);
 		}
-		if (ret < 0 && i > 0) {
-			unregister_jprobes(jps, i);
+		if (ret < 0) {
+			if (i > 0)
+				unregister_jprobes(jps, i);
 			break;
 		}
 	}
@@ -920,8 +922,9 @@ static int __register_kretprobes(struct kretprobe **rps, int num,
 		return -EINVAL;
 	for (i = 0; i < num; i++) {
 		ret = __register_kretprobe(rps[i], called_from);
-		if (ret < 0 && i > 0) {
-			unregister_kretprobes(rps, i);
+		if (ret < 0) {
+			if (i > 0)
+				unregister_kretprobes(rps, i);
 			break;
 		}
 	}