block: prevent mount point confusion

Do not perform substring matches when identifying mount points to
avoid returning wrong entries, e.g. "/dev/mmcblk0p10" when
"/dev/mmcblk0p1" was requested.

Fixes: FS#2196
Ref: https://bugs.openwrt.org/index.php?do=details&task_id=2196
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 2 deletions

diff --git a/block.c b/block.c
index cfc8727..39212d2 100644
--- a/block.c
+++ b/block.c
@@ -579,7 +579,6 @@ static char* find_mount_point(char *block)
 {
 	FILE *fp = fopen("/proc/self/mountinfo", "r");
 	static char line[256];
-	int len = strlen(block);
 	char *point = NULL, *pos, *tmp, *cpoint, *devname;
 	struct stat s;
 	int rstat;
@@ -643,7 +642,7 @@ static char* find_mount_point(char *block)
 
 		*pos = '\0';
 		devname = tmp;
-		if (!strncmp(block, devname, len)) {
+		if (!strcmp(block, devname)) {
 			point = strdup(cpoint);
 			break;
 		}