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gfs2: Another gfs2_walk_metadata fix

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[ Upstream commit 566a2ab3c9005f62e784bd39022d58d34ef4365c ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andreas Gruenbacher 2020-04-20 19:42:04 +02:00 committed by Greg Kroah-Hartman
parent 0a79765b56
commit ecf4cb653e
1 changed files with 9 additions and 7 deletions
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16
fs/gfs2/bmap.c
View file

@ -530,10 +530,12 @@ 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:
@ -879,10 +881,9 @@ 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;
@ -936,8 +937,6 @@ 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;
@ -959,6 +958,9 @@ 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;
}