From: Stefan Haberland sth@linux.ibm.com
[ Upstream commit 00b39f698a4f1ee897227cace2e3937fc4412270 ]
If for whatever reason the dasd_eckd_check_characteristics() function exits after at least some paths have their configuration data allocated those data is never freed again. In the error case the device->private pointer is set to NULL and dasd_eckd_uncheck_device() will exit without freeing the path data because of this NULL pointer.
Fix by calling dasd_eckd_clear_conf_data() for error cases.
Also use dasd_eckd_clear_conf_data() in dasd_eckd_uncheck_device() to avoid code duplication.
Reported-by: Qian Cai cai@lca.pw Reviewed-by: Jan Hoeppner hoeppner@linux.ibm.com Signed-off-by: Stefan Haberland sth@linux.ibm.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/s390/block/dasd_eckd.c | 19 ++----------------- 1 file changed, 2 insertions(+), 17 deletions(-)
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 108fb1c77e1d..a2e34c853ca9 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1770,7 +1770,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device) dasd_free_block(device->block); device->block = NULL; out_err1: - kfree(private->conf_data); + dasd_eckd_clear_conf_data(device); kfree(device->private); device->private = NULL; return rc; @@ -1779,7 +1779,6 @@ dasd_eckd_check_characteristics(struct dasd_device *device) static void dasd_eckd_uncheck_device(struct dasd_device *device) { struct dasd_eckd_private *private = device->private; - int i;
if (!private) return; @@ -1789,21 +1788,7 @@ static void dasd_eckd_uncheck_device(struct dasd_device *device) private->sneq = NULL; private->vdsneq = NULL; private->gneq = NULL; - private->conf_len = 0; - for (i = 0; i < 8; i++) { - kfree(device->path[i].conf_data); - if ((__u8 *)device->path[i].conf_data == - private->conf_data) { - private->conf_data = NULL; - private->conf_len = 0; - } - device->path[i].conf_data = NULL; - device->path[i].cssid = 0; - device->path[i].ssid = 0; - device->path[i].chpid = 0; - } - kfree(private->conf_data); - private->conf_data = NULL; + dasd_eckd_clear_conf_data(device); }
static struct dasd_ccw_req *