Commit 566a2ab3 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher

gfs2: Another gfs2_walk_metadata fix

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: a27a0c9b ("gfs2: gfs2_walk_metadata fix")
Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
parent d22f69a0
......@@ -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)
break;
if (hgt) {
if (mp->mp_list[hgt] >= sdp->sd_inptrs)
goto lower_metapath;
} else {
if (mp->mp_list[hgt] >= sdp->sd_diptrs)
break;
}
fill_up_metapath:
......@@ -876,10 +878,9 @@ 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;
......@@ -933,8 +934,6 @@ 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;
......@@ -956,6 +955,9 @@ 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;
}
......
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