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Commit 17e6afc7 authored by Dave Kleikamp's avatar Dave Kleikamp
Browse files

JFS: Avoid BUG() on a damaged file system 



On Mon, 2006-12-18 at 19:51 +0100, Eric Sesterhenn wrote:
> hi,
>
> while playing around with fsfuzzer, i got the following oops with jfs:
>
> [  851.804875] BUG at fs/jfs/jfs_xtree.c:760
> assert(!BT_STACK_FULL(btstack))
> [  851.805179] ------------[ cut here ]------------
> [  851.805238] kernel BUG at fs/jfs/jfs_xtree.c:760!

JFS should mark the superblock dirty and return an error rather than
calling BUG().

Signed-off-by: default avatarDave Kleikamp <shaggy@austin.ibm.com>
parent efa06708

fs/jfs/jfs_xtree.c

+15 −0
Original line number Diff line number Diff line
@@ -757,6 +757,11 @@ static int xtSearch(struct inode *ip, s64 xoff, s64 *nextp, 
			nsplit = 0;



		/* push (bn, index) of the parent page/entry */

		if (BT_STACK_FULL(btstack)) {

			jfs_error(ip->i_sb, "stack overrun in xtSearch!");

			XT_PUTPAGE(mp);

			return -EIO;

		}

		BT_PUSH(btstack, bn, index);



		/* get the child page block number */
@@ -3915,6 +3920,11 @@ s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int flag) 
	 */

      getChild:

	/* save current parent entry for the child page */

	if (BT_STACK_FULL(&btstack)) {

		jfs_error(ip->i_sb, "stack overrun in xtTruncate!");

		XT_PUTPAGE(mp);

		return -EIO;

	}

	BT_PUSH(&btstack, bn, index);



	/* get child page */
@@ -4112,6 +4122,11 @@ s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size) 
	 */

      getChild:

	/* save current parent entry for the child page */

	if (BT_STACK_FULL(&btstack)) {

		jfs_error(ip->i_sb, "stack overrun in xtTruncate_pmap!");

		XT_PUTPAGE(mp);

		return -EIO;

	}

	BT_PUSH(&btstack, bn, index);



	/* get child page */