From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
xfs_bmbt_irec.br_blockcount is declared as xfs_filblks_t, which is an
unsigned 64-bit integer. Though the bmbt helpers will never set a value
larger than 2^21 (since the underlying on-disk extent record has a
length field that is only 21 bits wide), we should be a little defensive
about checking that a bmbt record doesn't exceed what we're expecting or
overflow into the next AG.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/bmap.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index 3a815db..fa64bd4 100644
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -348,6 +348,7 @@ xfs_scrub_bmap_extent(
{
struct xfs_mount *mp = info->sc->mp;
struct xfs_buf *bp = NULL;
+ xfs_filblks_t end;
int error = 0;
if (cur)
@@ -375,19 +376,23 @@ xfs_scrub_bmap_extent(
irec->br_startoff);
/* Make sure the extent points to a valid place. */
+ if (irec->br_blockcount > MAXEXTLEN)
+ xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
+ irec->br_startoff);
if (irec->br_startblock + irec->br_blockcount <= irec->br_startblock)
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
+ end = irec->br_startblock + irec->br_blockcount - 1;
if (info->is_rt &&
(!xfs_verify_rtbno(mp, irec->br_startblock) ||
- !xfs_verify_rtbno(mp, irec->br_startblock +
- irec->br_blockcount - 1)))
+ !xfs_verify_rtbno(mp, end)))
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
if (!info->is_rt &&
(!xfs_verify_fsbno(mp, irec->br_startblock) ||
- !xfs_verify_fsbno(mp, irec->br_startblock +
- irec->br_blockcount - 1)))
+ !xfs_verify_fsbno(mp, end) ||
+ XFS_FSB_TO_AGNO(mp, irec->br_startblock) !=
+ XFS_FSB_TO_AGNO(mp, end)))
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
--
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