From: Martin Wilck Date: Mon, 29 Apr 2019 09:48:15 +0000 (+0200) Subject: dm mpath: always free attached_handler_name in parse_path() X-Git-Tag: v5.0.19~43 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=560c6fd312c9d8891f3282771178ba0b929356c8;p=thirdparty%2Fkernel%2Fstable.git dm mpath: always free attached_handler_name in parse_path() commit 940bc471780b004a5277c1931f52af363c2fc9da upstream. Commit b592211c33f7 ("dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer") fixed a memory leak for the case where setup_scsi_dh() returns failure. But setup_scsi_dh may return success and not "use" attached_handler_name if the retain_attached_hwhandler flag is not set on the map. As setup_scsi_sh properly "steals" the pointer by nullifying it, freeing it unconditionally in parse_path() is safe. Fixes: b592211c33f7 ("dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer") Cc: stable@vger.kernel.org Reported-by: Yufen Yu Signed-off-by: Martin Wilck Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 2ee5e357a0a71..cc5173dfd466b 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -882,6 +882,7 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps if (attached_handler_name || m->hw_handler_name) { INIT_DELAYED_WORK(&p->activate_path, activate_path_work); r = setup_scsi_dh(p->path.dev->bdev, m, &attached_handler_name, &ti->error); + kfree(attached_handler_name); if (r) { dm_put_device(ti, p->path.dev); goto bad; @@ -896,7 +897,6 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps return p; bad: - kfree(attached_handler_name); free_pgpath(p); return ERR_PTR(r); }