swaplabel: check blkid_probe_lookup_value() result [coverity scan]

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

diff --git a/disk-utils/swaplabel.c b/disk-utils/swaplabel.c
index bf4ee71c2d88576943d135ff92c4692092ec5690..44b1cb368e26a54739edd0e242a38a98758f6e6e 100644 (file)
--- a/disk-utils/swaplabel.c
+++ b/disk-utils/swaplabel.c
@@ -68,8 +68,9 @@ static blkid_probe get_swap_prober(const char *devname)
 
        if (rc == 0) {
                /* supported is SWAPSPACE2 only */
-               blkid_probe_lookup_value(pr, "VERSION", &version, NULL);
-               if (strcmp(version, "2"))
+               if (blkid_probe_lookup_value(pr, "VERSION", &version, NULL) == 0
+                   && version
+                   && strcmp(version, "2"))
                        warnx(_("%s: unsupported swap version '%s'"),
                                                devname, version);
                else