blob: 72c30fe2cccb98fdb1f7274ae705011ad23fbfac [file] [log] [blame]
From 96993290ff391b63af73de2df09cd4ff5ade3563 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Mon, 20 Apr 2020 19:42:04 +0200
Subject: [PATCH] gfs2: Another gfs2_walk_metadata fix
commit 566a2ab3c9005f62e784bd39022d58d34ef4365c upstream.
Make sure we don't walk past the end of the metadata in gfs2_walk_metadata: the
inode holds fewer pointers than indirect blocks.
Slightly clean up gfs2_iomap_get.
Fixes: a27a0c9b6a20 ("gfs2: gfs2_walk_metadata fix")
Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b47939900932..29cc55193ce5 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -528,10 +528,12 @@ static int gfs2_walk_metadata(struct inode *inode, struct metapath *mp,
/* Advance in metadata tree. */
(mp->mp_list[hgt])++;
- if (mp->mp_list[hgt] >= sdp->sd_inptrs) {
- if (!hgt)
+ if (hgt) {
+ if (mp->mp_list[hgt] >= sdp->sd_inptrs)
+ goto lower_metapath;
+ } else {
+ if (mp->mp_list[hgt] >= sdp->sd_diptrs)
break;
- goto lower_metapath;
}
fill_up_metapath:
@@ -877,10 +879,9 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
ret = -ENOENT;
goto unlock;
} else {
- /* report a hole */
iomap->offset = pos;
iomap->length = length;
- goto do_alloc;
+ goto hole_found;
}
}
iomap->length = size;
@@ -934,8 +935,6 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
return ret;
do_alloc:
- iomap->addr = IOMAP_NULL_ADDR;
- iomap->type = IOMAP_HOLE;
if (flags & IOMAP_REPORT) {
if (pos >= size)
ret = -ENOENT;
@@ -957,6 +956,9 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
if (pos < size && height == ip->i_height)
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
}
+hole_found:
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->type = IOMAP_HOLE;
goto out;
}
--
2.7.4