lib/ismounted: more robust buffer usage [clang-analyze]

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

diff --git a/lib/ismounted.c b/lib/ismounted.c
index 2463f3356a8018ec6ce7745f73af30fc63cb1783..8a882b27e665144b378761fa5c806222b04a34cd 100644 (file)
--- a/lib/ismounted.c
+++ b/lib/ismounted.c
@@ -317,7 +317,8 @@ int check_mount_point(const char *device, int *mount_flags,
 
        if (is_swap_device(device)) {
                *mount_flags = MF_MOUNTED | MF_SWAP;
-               strncpy(mtpt, "<swap>", mtlen);
+               if (mtpt && mtlen)
+                       strncpy(mtpt, "<swap>", mtlen);
        } else {
 #ifdef HAVE_MNTENT_H
                retval = check_mntent(device, mount_flags, mtpt, mtlen);