From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 15 May 2019 22:56:17 -0500
Subject: signal: Properly set TRACE_SIGNAL_LOSE_INFO in __send_signal
Git-commit: 8917bef336f5301edd616cfa97b97d0319fd0496
Patch-mainline: v5.3-rc1
References: bsc#1157463

Any time siginfo is not stored in the signal queue information is
lost.  Therefore set TRACE_SIGNAL_LOSE_INFO every time the code does
not allocate a signal queue entry, and a queue overflow abort is not
triggered.

Fixes: ba005e1f4172 ("tracepoint: Add signal loss events")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Michal Koutný <mkoutny@suse.com>
---
 kernel/signal.c |   33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1110,23 +1110,22 @@ static int __send_signal(int sig, struct
 
 		userns_fixup_signal_uid(&q->info, t);
 
-	} else if (!is_si_special(info)) {
-		if (sig >= SIGRTMIN && info->si_code != SI_USER) {
-			/*
-			 * Queue overflow, abort.  We may abort if the
-			 * signal was rt and sent by user using something
-			 * other than kill().
-			 */
-			result = TRACE_SIGNAL_OVERFLOW_FAIL;
-			ret = -EAGAIN;
-			goto ret;
-		} else {
-			/*
-			 * This is a silent loss of information.  We still
-			 * send the signal, but the *info bits are lost.
-			 */
-			result = TRACE_SIGNAL_LOSE_INFO;
-		}
+	} else if (!is_si_special(info) &&
+		   sig >= SIGRTMIN && info->si_code != SI_USER) {
+		/*
+		 * Queue overflow, abort.  We may abort if the
+		 * signal was rt and sent by user using something
+		 * other than kill().
+		 */
+		result = TRACE_SIGNAL_OVERFLOW_FAIL;
+		ret = -EAGAIN;
+		goto ret;
+	} else {
+		/*
+		 * This is a silent loss of information.  We still
+		 * send the signal, but the *info bits are lost.
+		 */
+		result = TRACE_SIGNAL_LOSE_INFO;
 	}
 
 out_set: