commit 8a6c4ff3f407b916bc08da4e76ed7813768ac937
Author: mildis <me@mildis.org>
Date:   Tue Oct 2 16:46:34 2018 +0200

    BUG/MINOR: checks: queues null-deref
    
    queues can be null if calloc() failed.
    Bypass free* calls when calloc did fail.
    
    (cherry picked from commit 5ab01cb01114065a3573570a48e84815e751bf14)
    Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/src/checks.c b/src/checks.c
index 098ddecf..74958b2d 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -3182,7 +3182,7 @@ int init_email_alert(struct mailers *mls, struct proxy *p, char **err)
 
 	if ((queues = calloc(mls->count, sizeof(*queues))) == NULL) {
 		memprintf(err, "out of memory while allocating mailer alerts queues");
-		goto error;
+		goto fail_no_queue;
 	}
 
 	for (mailer = mls->mailer_list; mailer; i++, mailer = mailer->next) {
@@ -3239,6 +3239,7 @@ int init_email_alert(struct mailers *mls, struct proxy *p, char **err)
 		free_check(check);
 	}
 	free(queues);
+  fail_no_queue:
 	return 1;
 }