X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fdf.c;h=af54c92f9f7da4ce3c919deb11d93c12478e8d85;hb=357cae102b2994f1874f5691dc571543111bd5fa;hp=4a86799c2e5d7ec7a3bbb6b3003bca8879eede0b;hpb=3d74a63ae43c1786eb9b966e2209c24c5643dae8;p=collectd.git

diff --git a/src/df.c b/src/df.c
index 4a86799c..af54c92f 100644
--- a/src/df.c
+++ b/src/df.c
@@ -229,7 +229,10 @@ static int df_read (void)
 			}
 
 			/* Duplicate found: leave non-NULL dup_ptr. */
-			if (by_device && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
+			if (by_device
+                            && (mnt_ptr->spec_device != NULL)
+                            && (dup_ptr->spec_device != NULL)
+                            && (strcmp (mnt_ptr->spec_device, dup_ptr->spec_device) == 0))
 				break;
 			else if (!by_device && (strcmp (mnt_ptr->dir, dup_ptr->dir) == 0))
 				break;