From cfcdb5bad34f600aed7613c3c1a5e618111f77b7 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Tue, 28 Mar 2023 00:43:16 +0200 Subject: [PATCH] gfs2: Fix inode height consistency check The maximum allowed height of an inode's metadata tree depends on the filesystem block size; it is lower for bigger-block filesystems. When reading in an inode, make sure that the height doesn't exceed the maximum allowed height. Arrays like sd_heightsize are sized to be big enough for any filesystem block size; they will often be slightly bigger than what's needed for a specific filesystem. Reported-by: syzbot+45d4691b1ed3c48eba05@syzkaller.appspotmail.com Signed-off-by: Andreas Gruenbacher --- fs/gfs2/glops.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c index 4d99cc77a29b..b65950e76be5 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -396,6 +396,7 @@ static int inode_go_demote_ok(const struct gfs2_glock *gl) static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) { + struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); const struct gfs2_dinode *str = buf; struct timespec64 atime; u16 height, depth; @@ -442,7 +443,7 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */ gfs2_set_inode_flags(inode); height = be16_to_cpu(str->di_height); - if (unlikely(height > GFS2_MAX_META_HEIGHT)) + if (unlikely(height > sdp->sd_max_height)) goto corrupt; ip->i_height = (u8)height;