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    Subject[PATCH 29/51] [GFS2] panic after can't parse mount arguments
    From: Abhijith Das <>

    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 <>
    Signed-off-by: Steven Whitehouse <>

    diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
    index 9e0e9be..314c113 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);
    + }

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      Last update: 2007-10-04 11:31    [W:0.019 / U:19.020 seconds]
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