From: Wu Bo wubo40@huawei.com
commit 83c6f2390040f188cc25b270b4befeb5628c1aee upstream.
If the __copy_from_user function failed we need to call sg_remove_request in sg_write.
Link: https://lore.kernel.org/r/610618d9-e983-fd56-ed0f-639428343af7@huawei.com Acked-by: Douglas Gilbert dgilbert@interlog.com Signed-off-by: Wu Bo wubo40@huawei.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org [groeck: Backport to v5.4.y and older kernels] Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/sg.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -695,8 +695,10 @@ sg_write(struct file *filp, const char _ hp->flags = input_size; /* structure abuse ... */ hp->pack_id = old_hdr.pack_id; hp->usr_ptr = NULL; - if (__copy_from_user(cmnd, buf, cmd_size)) + if (__copy_from_user(cmnd, buf, cmd_size)) { + sg_remove_request(sfp, srp); return -EFAULT; + } /* * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, * but is is possible that the app intended SG_DXFER_TO_DEV, because there