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From cae4fd291266c32441c6a7fcca49929fe11c391c Mon Sep 17 00:00:00 2001
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
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Date: Fri, 10 Jul 2020 15:35:44 -0400
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Subject: [PATCH] xfs_repair: check for AG btree records that would wrap around
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For AG btree types, make sure that each record's length is not so huge
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that integer wraparound would happen.
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Found via xfs/358 fuzzing recs[1].blockcount = ones.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Christoph Hellwig <hch@lst.de>
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Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
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---
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repair/scan.c | 9 ++++++---
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1 file changed, 6 insertions(+), 3 deletions(-)
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diff --git a/repair/scan.c b/repair/scan.c
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index 5c8d8b23..1ddb5763 100644
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--- a/repair/scan.c
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+++ b/repair/scan.c
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@@ -684,7 +684,8 @@ _("%s freespace btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
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b, i, name, agno, bno);
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continue;
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}
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- if (len == 0 || !verify_agbno(mp, agno, end - 1)) {
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+ if (len == 0 || end <= b ||
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+ !verify_agbno(mp, agno, end - 1)) {
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do_warn(
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_("invalid length %u in record %u of %s btree block %u/%u\n"),
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len, i, name, agno, bno);
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@@ -1066,7 +1067,8 @@ _("%s rmap btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
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b, i, name, agno, bno);
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continue;
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}
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- if (len == 0 || !verify_agbno(mp, agno, end - 1)) {
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+ if (len == 0 || end <= b ||
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+ !verify_agbno(mp, agno, end - 1)) {
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do_warn(
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_("invalid length %u in record %u of %s btree block %u/%u\n"),
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len, i, name, agno, bno);
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@@ -1353,7 +1355,8 @@ _("leftover CoW extent has invalid startblock in record %u of %s btree block %u/
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b, i, name, agno, bno);
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continue;
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}
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- if (len == 0 || !verify_agbno(mp, agno, end - 1)) {
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+ if (len == 0 || end <= agb ||
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+ !verify_agbno(mp, agno, end - 1)) {
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do_warn(
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_("invalid length %u in record %u of %s btree block %u/%u\n"),
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len, i, name, agno, bno);
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--
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2.29.2
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