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| author |   Abhijith Das <adas@redhat.com> | 2007-08-23 13:33:01 -0500 |
|---|---|---|
| committer |   Steven Whitehouse <swhiteho@redhat.com> | 2007-10-10 08:55:46 +0100 |
| commit | d1e2777d4f419a865ddccdb9b3412021d0e4de51 (patch) | |
| tree | e21f64e03846aeae4a1118a2debfaac331e6256f /fs/gfs2/ops_fstype.c | |
| parent | [GFS2] Patch to protect sd_log_num_jdata (diff) | |
| download | linux-dev-d1e2777d4f419a865ddccdb9b3412021d0e4de51.tar.xz linux-dev-d1e2777d4f419a865ddccdb9b3412021d0e4de51.zip | |
[GFS2] panic after can't parse mount arguments
When you try to mount gfs2 with -o garbage, the mount fails and the gfs2
superblock is deallocated and becomes NULL. The vfs comes around later
on and calls gfs2_kill_sb. At this point the hidden gfs2 superblock
pointer (sb->s_fs_info) is NULL and dereferencing it through
gfs2_meta_syncfs causes the panic. (the other function call to
gfs2_delete_debugfs_file() succeeds because this function already checks
for a NULL pointer)
Signed-off-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/gfs2/ops_fstype.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 9e0e9be1e41d..314c1134d12d 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -887,8 +887,10 @@ error: static void gfs2_kill_sb(struct super_block *sb) { - gfs2_delete_debugfs_file(sb->s_fs_info); - gfs2_meta_syncfs(sb->s_fs_info); + if (sb->s_fs_info) { + gfs2_delete_debugfs_file(sb->s_fs_info); + gfs2_meta_syncfs(sb->s_fs_info); + } kill_block_super(sb); } |