diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2019-10-09 10:35:36 -0700 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2019-10-26 16:01:37 +0530 |
| commit | cc17315fe7723aab3fae92ef677a9870ef1b9308 (patch) | |
| tree | 5b3864dac22c96f46d94885603bac420492d1610 | |
| parent | 6937c2a770252a366e211a7f3b2076ab27532ac5 (diff) | |
| download | 96b-common-cc17315fe7723aab3fae92ef677a9870ef1b9308.tar.gz | |
scsi: ch: Make it possible to open a ch device multiple times again
Clearing ch->device in ch_release() is wrong because that pointer must
remain valid until ch_remove() is called. This patch fixes the following
crash the second time a ch device is opened:
BUG: kernel NULL pointer dereference, address: 0000000000000790
RIP: 0010:scsi_device_get+0x5/0x60
Call Trace:
ch_open+0x4c/0xa0 [ch]
chrdev_open+0xa2/0x1c0
do_dentry_open+0x13a/0x380
path_openat+0x591/0x1470
do_filp_open+0x91/0x100
do_sys_open+0x184/0x220
do_syscall_64+0x5f/0x1a0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: 085e56766f74 ("scsi: ch: add refcounting")
Cc: Hannes Reinecke <hare@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191009173536.247889-1-bvanassche@acm.org
Reported-by: Rob Turk <robtu@rtist.nl>
Suggested-by: Rob Turk <robtu@rtist.nl>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/ch.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c index 5f8153c37f77..76751d6c7f0d 100644 --- a/drivers/scsi/ch.c +++ b/drivers/scsi/ch.c @@ -579,7 +579,6 @@ ch_release(struct inode *inode, struct file *file) scsi_changer *ch = file->private_data; scsi_device_put(ch->device); - ch->device = NULL; file->private_data = NULL; kref_put(&ch->ref, ch_destroy); return 0; |