Underlying fs may not be able to handle the length in fiemap beyond sb->s_maxbytes. So similar to how VFS ioctl does it, add fiemap_check_ranges() check in ovl_fiemap() as well before calling underlying fs i_op->fiemap() call. Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx> --- fs/overlayfs/inode.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 79e8994e3bc1..9bcd2e96faad 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -455,16 +455,21 @@ static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, int err; struct inode *realinode = ovl_inode_real(inode); const struct cred *old_cred; + u64 length; if (!realinode->i_op->fiemap) return -EOPNOTSUPP; + err = fiemap_check_ranges(realinode->i_sb, start, len, &length); + if (err) + return err; + old_cred = ovl_override_creds(inode->i_sb); if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC) filemap_write_and_wait(realinode->i_mapping); - err = realinode->i_op->fiemap(realinode, fieinfo, start, len); + err = realinode->i_op->fiemap(realinode, fieinfo, start, length); revert_creds(old_cred); return err; -- 2.21.0
