Fixed labels exactly 16 bytes in length.

[dump.git] / compat / lib / bylabel.c

diff --git a/compat/lib/bylabel.c b/compat/lib/bylabel.c
index 07f0dd92320ccb112b773a9eb54e44b1a826256c..7f710ed7655e7196cef4a528cb5c92a242dc48e9 100644 (file)
--- a/compat/lib/bylabel.c
+++ b/compat/lib/bylabel.c
@@ -29,12 +29,14 @@
 #define EXT2_SUPER_SIZE                sizeof(struct ext2_super_block)
 #define EXT2_SUPER_MAGIC       0xEF53
 
+#define VOLNAMSZ       16
+
 struct ext2_super_block {
        unsigned char   s_dummy1[56];
        unsigned char   s_magic[2];
        unsigned char   s_dummy2[46];
        unsigned char   s_uuid[16];
-       unsigned char   s_volume_name[16];
+       unsigned char   s_volume_name[VOLNAMSZ];
 };
 #define ext2magic(s)   ((unsigned int) s.s_magic[0] + (((unsigned int) s.s_magic[1]) << 8))
 
@@ -71,7 +73,9 @@ get_label_uuid(const char *device, char **label, char *uuid) {
 
        /* superblock is ext2 - now what is its label? */
        memcpy(uuid, e2sb.s_uuid, sizeof(e2sb.s_uuid));
-       *label = strdup(e2sb.s_volume_name);
+       *label = malloc(VOLNAMSZ + 1);
+       strncpy(*label, e2sb.s_volume_name, VOLNAMSZ);
+       (*label)[VOLNAMSZ] = 0;
 
        return 0;
 }