From acd2c8aa02f302ed838348052e16ee575c645147 Mon Sep 17 00:00:00 2001 From: Abhijith Das Date: Mon, 15 Sep 2008 08:54:06 -0500 Subject: GFS2: GFS2 will panic if you misspell any mount options The gfs2 superblock pointer is NULL after a failed mount. When control eventually goes to gfs2_kill_sb, we dereference this NULL pointer. This patch ensures that the gfs2 superblock pointer is not NULL before being dereferenced in gfs2_kill_sb. Signed-off-by: Abhijith Das Signed-off-by: Steven Whitehouse --- fs/gfs2/ops_fstype.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index a6225cce2cbc..ae35f097aa6a 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -1237,14 +1237,17 @@ static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags, static void gfs2_kill_sb(struct super_block *sb) { struct gfs2_sbd *sdp = sb->s_fs_info; - gfs2_meta_syncfs(sdp); - dput(sdp->sd_root_dir); - dput(sdp->sd_master_dir); - sdp->sd_root_dir = NULL; - sdp->sd_master_dir = NULL; + if (sdp) { + gfs2_meta_syncfs(sdp); + dput(sdp->sd_root_dir); + dput(sdp->sd_master_dir); + sdp->sd_root_dir = NULL; + sdp->sd_master_dir = NULL; + } shrink_dcache_sb(sb); kill_block_super(sb); - gfs2_delete_debugfs_file(sdp); + if (sdp) + gfs2_delete_debugfs_file(sdp); } struct file_system_type gfs2_fs_type = { -- cgit v1.2.2