mount: -L|-U segfault when label or uuid doesn't exist

 # mount -L foo
 Segmentation fault

mount(8) calls strcmp() with NULL argument.

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/mount/mount.c b/mount/mount.c
index 5bc2b30c331146bd39b6932040d1cd3db5238d11..96776db3b9e37ffcde2737a716e659b82cbbaf9c 100644 (file)
--- a/mount/mount.c
+++ b/mount/mount.c
@@ -1699,6 +1699,9 @@ getfs(const char *spec, const char *uuid, const char *label)
        struct mntentchn *mc = NULL;
        const char *devname = NULL;
 
+       if (!spec && !uuid && !label)
+               return NULL;
+
        /*
         * A) 99% of all cases, the spec on cmdline matches
         *    with spec in fstab
@@ -1761,7 +1764,7 @@ getfs(const char *spec, const char *uuid, const char *label)
         *    Earlier mtab was tried first, but this would sometimes try the
         *    wrong mount in case mtab had the root device entry wrong.
         */
-       if (!mc)
+       if (!mc && (devname || spec))
                mc = getmntfile (devname ? devname : spec);
 
        if (devname)
@@ -1981,12 +1984,17 @@ main(int argc, char *argv[]) {
 
        case 1:
                /* mount [-nfrvw] [-o options] special | node
+                * mount -L label  (or -U uuid)
                 * (/etc/fstab is necessary)
                 */
                if (types != NULL)
                        usage (stderr, EX_USAGE);
 
-               mc = getfs(*argv, uuid, label);
+               if (uuid || label)
+                       mc = getfs(NULL, uuid, label);
+               else
+                       mc = getfs(*argv, NULL, NULL);
+
                if (!mc) {
                        if (uuid || label)
                                die (EX_USAGE, _("mount: no such partition found"));