From: Daniel Golle <daniel@makrotopia.org>
Date: Fri, 30 Jun 2017 15:20:22 +0000 (+0200)
Subject: libfstools: fix matching device name
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Ffstools.git;a=commitdiff_plain;h=f038a610bdee22da308a64c9e225de72dd4dd75e

libfstools: fix matching device name

compare strlen()+1 characters to make sure we match the trailing \0 as
well. Otherwise things get fishy when using lvm2, see this example:

/dev/mapper/data: UUID="xxxxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxxxx" MOUNT="/mnt" TYPE="LVM2_member"
/dev/mapper/data-fs: UUID="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" LABEL="xxxxxxxx" VERSION="1.0" MOUNT="/mnt" TYPE="ext4"

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---

diff --git a/libfstools/find.c b/libfstools/find.c
index 190fa81..fcc47a7 100644
--- a/libfstools/find.c
+++ b/libfstools/find.c
@@ -46,7 +46,6 @@ find_mount(char *mp)
 {
 	FILE *fp = fopen("/proc/mounts", "r");
 	static char line[256];
-	char *point = NULL;
 
 	if(!fp)
 		return NULL;
@@ -75,7 +74,7 @@ find_mount(char *mp)
 
 	fclose(fp);
 
-	return point;
+	return NULL;
 }
 
 /*
@@ -184,7 +183,7 @@ find_mount_point(char *block, int root_only)
 		devname = tmp;
 
 		/* if device name matches */
-		if (!strncmp(block, devname, len)) {
+		if (!strncmp(block, devname, len + 1)) {
 			if (root_only && fs_rootfs_only(fstype))
 				break;