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[GFS2] panic after can't parse mount arguments

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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>
This commit is contained in:
Abhijith Das 2007-08-23 13:33:01 -05:00 committed by Steven Whitehouse
parent ec217e0ece
commit d1e2777d4f
1 changed files with 4 additions and 2 deletions
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6
fs/gfs2/ops_fstype.c
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@ -887,8 +887,10 @@ error:
static void gfs2_kill_sb(struct super_block *sb) static void gfs2_kill_sb(struct super_block *sb)
{ {
gfs2_delete_debugfs_file(sb->s_fs_info); if (sb->s_fs_info) {
gfs2_meta_syncfs(sb->s_fs_info); gfs2_delete_debugfs_file(sb->s_fs_info);
gfs2_meta_syncfs(sb->s_fs_info);
}
kill_block_super(sb); kill_block_super(sb);
} }