From: Darrick J. Wong <djwong@kernel.org>
Date: Mon, 15 Apr 2024 23:07:50 +0000 (-0700)
Subject: xfs_repair: constrain attr fork extent count
X-Git-Tag: v6.8.0~12
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=346ce6d57f96221d4be4d16ccaeefc4b5d2807c3;p=thirdparty%2Fxfsprogs-dev.git

xfs_repair: constrain attr fork extent count

Don't let the attr fork extent count exceed the maximum possible value.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/repair/dinode.c b/repair/dinode.c
index b8f5bf4e..bf93a579 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -2050,6 +2050,7 @@ process_inode_attr_fork(
 	xfs_ino_t		lino = XFS_AGINO_TO_INO(mp, agno, ino);
 	struct xfs_dinode	*dino = *dinop;
 	struct blkmap		*ablkmap = NULL;
+	xfs_extnum_t		max_nex;
 	int			repair = 0;
 	int			err;
 	int			try_rebuild = -1; /* don't know yet */
@@ -2071,6 +2072,11 @@ retry:
 	}
 
 	*anextents = xfs_dfork_attr_extents(dino);
+	max_nex = xfs_iext_max_nextents(
+			xfs_dinode_has_large_extent_counts(dino),
+			XFS_ATTR_FORK);
+	if (*anextents > max_nex)
+		*anextents = 1;
 	if (*anextents > be64_to_cpu(dino->di_nblocks))
 		*anextents = 1;