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Looks good. Will add this to jfs-next. Thanks, Shaggy > > Reported-and-tested-by: syzbot+7c808908291a569281a9@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=7c808908291a569281a9 > Signed-off-by: Edward Adam Davis > --- > V1 -> V2: move the check to dbMount > > fs/jfs/jfs_dmap.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c > index f9009e4f9ffd..62f55e7ed840 100644 > --- a/fs/jfs/jfs_dmap.c > +++ b/fs/jfs/jfs_dmap.c > @@ -204,6 +204,10 @@ int dbMount(struct inode *ipbmap) > bmp->db_aglevel = le32_to_cpu(dbmp_le->dn_aglevel); > bmp->db_agheight = le32_to_cpu(dbmp_le->dn_agheight); > bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth); > + if (!bmp->db_agwidth) { > + err = -EINVAL; > + goto err_release_metapage; > + } > bmp->db_agstart = le32_to_cpu(dbmp_le->dn_agstart); > bmp->db_agl2size = le32_to_cpu(dbmp_le->dn_agl2size); > if (bmp->db_agl2size > L2MAXL2SIZE - L2MAXAG ||