xfs: fix UAF in xchk_btree_check_block_owner

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commit 1c253e1122 upstream.

We cannot dereference bs->cur when trying to determine if bs->cur
aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed.
Fix this by sampling before type before any freeing could happen.
The correct temporal ordering was broken when we removed xfs_btnum_t.

Cc: r772577952@gmail.com
Cc: <stable@vger.kernel.org> # v6.9
Fixes: ec793e690f ("xfs: remove xfs_btnum_t")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jiaming Zhang <r772577952@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Darrick J. Wong 2026-01-23 09:27:39 -08:00 • committed by Greg Kroah-Hartman

parent d741534302

commit ed82e7949f

1 changed files with 5 additions and 2 deletions

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fs/xfs/scrub/btree.c

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