psmisc/0004-NULLptr-sanity-added-in-scan-fns-to-avoid-useless-pr.patch

From 499dfe62817f46e2132dd265dbe3603e5929279e Mon Sep 17 00:00:00 2001
From: Jan Rybar <jrybar@redhat.com>
Date: Tue, 19 Feb 2019 16:39:17 +0100
Subject: [PATCH 04/11] NULLptr sanity added in scan fns to avoid useless prep
 work (stalls NFS)

---
 src/fuser.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/fuser.c b/src/fuser.c
index c44cee8..b8662a3 100644
--- a/src/fuser.c
+++ b/src/fuser.c
@@ -188,6 +188,9 @@ scan_procs(struct names *names_head, struct inode_list *ino_head,
 	pid_t pid, my_pid;
 	uid_t uid;
 
+	if ( (ino_head == NULL) && (dev_head == NULL) )
+		return;
+
 	if ((topproc_dir = opendir("/proc")) == NULL) {
 		fprintf(stderr, _("Cannot open /proc directory: %s\n"),
 			strerror(errno));
@@ -1873,6 +1876,10 @@ scan_knfsd(struct names *names_head, struct inode_list *ino_head,
 	char *find_space;
 	struct stat st;
 
+	if ( (ino_head == NULL) && (dev_head == NULL) )
+		return;
+
+
 	if ((fp = fopen(KNFSD_EXPORTS, "r")) == NULL) {
 #ifdef DEBUG
 		printf("Cannot open %s\n", KNFSD_EXPORTS);
@@ -1919,6 +1926,10 @@ scan_mounts(struct names *names_head, struct inode_list *ino_head,
 	char *find_space;
 	struct stat st;
 
+	if ( (ino_head == NULL) && (dev_head == NULL) )
+		return;
+
+
 	if ((fp = fopen(PROC_MOUNTS, "r")) == NULL) {
 		fprintf(stderr, "Cannot open %s\n", PROC_MOUNTS);
 		return;
@@ -1962,6 +1973,9 @@ scan_swaps(struct names *names_head, struct inode_list *ino_head,
 	char *find_space;
 	struct stat st;
 
+	if ( (ino_head == NULL) && (dev_head == NULL) )
+		return;
+
 	if ((fp = fopen(PROC_SWAPS, "r")) == NULL) {
 		/*fprintf(stderr, "Cannot open %s\n", PROC_SWAPS); */
 		return;
-- 
2.20.1