]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
rbd: don't leak parent_spec in rbd_dev_probe_parent()
authorIlya Dryomov <idryomov@gmail.com>
Sun, 11 Oct 2015 17:38:00 +0000 (19:38 +0200)
committerIlya Dryomov <idryomov@gmail.com>
Fri, 23 Oct 2015 16:36:03 +0000 (18:36 +0200)
commit1f2c6651f69c14d0d3a9cfbda44ea101b02160ba
treee306645e6644fe420d3bd45388f5b4e33c1cac4c
parent7379047d5585187d1288486d4627873170d0005a
rbd: don't leak parent_spec in rbd_dev_probe_parent()

Currently we leak parent_spec and trigger a "parent reference
underflow" warning if rbd_dev_create() in rbd_dev_probe_parent() fails.
The problem is we take the !parent out_err branch and that only drops
refcounts; parent_spec that would've been freed had we called
rbd_dev_unparent() remains and triggers rbd_warn() in
rbd_dev_parent_put() - at that point we have parent_spec != NULL and
parent_ref == 0, so counter ends up being -1 after the decrement.

Redo rbd_dev_probe_parent() to fix this.

Cc: stable@vger.kernel.org # 3.10+, needs backporting for < 4.2
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
drivers/block/rbd.c