commit 6e580b6e744011e87c337ebe2c082acfd5ca835a
Author: Christopher Faulet <cfaulet@haproxy.com>
Date:   Tue Apr 30 14:03:56 2019 +0200

    MINOR: config: Test validity of tune.maxaccept during the config parsing
    
    Only -1 and positive integers from 0 to INT_MAX are accepted. An error is
    triggered during the config parsing for any other values.
    
    This patch may be backported to all supported versions.
    
    (cherry picked from commit 6b02ab87348090efec73b1dd24f414239669f279)
    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
    (cherry picked from commit 2bbc40f8bc9a52ba0d03b25270ac0129cca29bba)
    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

diff --git a/src/cfgparse.c b/src/cfgparse.c
index c178538b..8e325416 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -789,6 +789,8 @@ int cfg_parse_global(const char *file, int linenum, char **args, int kwm)
 		global.tune.maxpollevents = atol(args[1]);
 	}
 	else if (!strcmp(args[0], "tune.maxaccept")) {
+		long max;
+
 		if (alertif_too_many_args(1, file, linenum, args, &err_code))
 			goto out;
 		if (global.tune.maxaccept != 0) {
@@ -801,7 +803,13 @@ int cfg_parse_global(const char *file, int linenum, char **args, int kwm)
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;
 		}
-		global.tune.maxaccept = atol(args[1]);
+		max = atol(args[1]);
+		if (/*max < -1 || */max > INT_MAX) {
+			ha_alert("parsing [%s:%d] : '%s' expects -1 or an integer from 0 to INT_MAX.\n", file, linenum, args[0]);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+		global.tune.maxaccept = max;
 	}
 	else if (!strcmp(args[0], "tune.chksize")) {
 		if (alertif_too_many_args(1, file, linenum, args, &err_code))