ext3_orphan_del may double-decrement bh->b_count

[Jeff Mahoney]

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Andrew -

Chris Mason and I ran across this one while hunting down another bug.

If ext3_mark_iloc_dirty() fails in ext3_orphan_del() on the outer
buffer, bh->b_count will be decremented twice. ext3_mark_iloc_dirty()
will brelse the buffer, even on error. ext3_orphan_del() is explicity
brelse'ing the buffer on error. Prior to calling ext3_mark_iloc_dirty(),
this is the correct behavior.

Fix attached.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
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#
# ext3_mark_iloc_dirty brelse's the buffer even on error,
# jumping to the out_brelse label causes a double decrement to occur.
#
--- linux-2.5.orig/fs/ext3/namei.c.orig	2004-06-02 11:46:52.903565552 -0400
+++ linux-2.5/fs/ext3/namei.c	2004-06-02 11:47:00.494411568 -0400
@@ -1963,7 +1963,7 @@
 	NEXT_ORPHAN(inode) = 0;
 	err = ext3_mark_iloc_dirty(handle, inode, &iloc);
 	if (err)
-		goto out_brelse;
+		goto out_err;
 
 out_err:
 	ext3_std_error(inode->i_sb, err);