From: Stefan Haberland <sth@xxxxxxxxxxxxx>
[ 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@xxxxxx>
Reviewed-by: Jan Hoeppner <hoeppner@xxxxxxxxxxxxx>
Signed-off-by: Stefan Haberland <sth@xxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 *
--
2.20.1
