From ca306cd403bf666a6703a59be4a3ce36406f6659 Mon Sep 17 00:00:00 2001
From: Philipp Rudo <prudo@redhat.com>
Date: Mon, 3 Apr 2023 16:54:57 +0200
Subject: [PATCH] kdump-lib-initramfs: harden is_mounted

If the device/mountpoint for findmnt is omitted findmnt will list all
mounted filesystems. In that case it will always return "true". So
explicitly check if an argument was passed to prevent false-positives.

Signed-off-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Coiby Xu <coxu@redhat.com>
---
 kdump-lib-initramfs.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kdump-lib-initramfs.sh b/kdump-lib-initramfs.sh
index a625634..c6338c6 100755
--- a/kdump-lib-initramfs.sh
+++ b/kdump-lib-initramfs.sh
@@ -30,7 +30,7 @@ kdump_get_conf_val()
 
 is_mounted()
 {
-	findmnt -k -n "$1" > /dev/null 2>&1
+	[ -n "$1" ] && findmnt -k -n "$1" > /dev/null 2>&1
 }
 
 # $1: info type