mke2fs: Avoid potential NULL dereference

... in the very unlikely case that e2p_os2string fails to allocate
memory.

Reported-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 9010f53..9c8ccfc 100644 (file)
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -552,11 +552,10 @@ static void show_stats(ext2_filsys fs)
        memset(buf, 0, sizeof(buf));
        strncpy(buf, s->s_volume_name, sizeof(s->s_volume_name));
        printf(_("Filesystem label=%s\n"), buf);
-       fputs(_("OS type: "), stdout);
-        os = e2p_os2string(fs->super->s_creator_os);
-       fputs(os, stdout);
+       os = e2p_os2string(fs->super->s_creator_os);
+       if (os)
+               printf(_("OS type: %s\n"), os);
        free(os);
-       printf("\n");
        printf(_("Block size=%u (log=%u)\n"), fs->blocksize,
                s->s_log_block_size);
        printf(_("Fragment size=%u (log=%u)\n"), fs->fragsize,