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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Hannes Reinecke <hare@suse.de>, Hannes Reinecke <hare@suse.com>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 079/115] scsi: sg: close race condition in
 sg_remove_sfp_usercontext()
Thread-Topic: [PATCH AUTOSEL for 4.4 079/115] scsi: sg: close race condition
 in sg_remove_sfp_usercontext()
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Date:   Sat, 3 Mar 2018 22:31:36 +0000
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From: Hannes Reinecke <hare@suse.de>

[ Upstream commit 97d27b0dd015e980ade63fda111fd1353276e28b ]

sg_remove_sfp_usercontext() is clearing any sg requests, but needs to
take 'rq_list_lock' when modifying the list.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Tested-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/scsi/sg.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 27f92f4ea6bc..dedaf3e89bb5 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -535,6 +535,7 @@ sg_read(struct file *filp, char __user *buf, size_t cou=
nt, loff_t * ppos)
 	} else
 		count =3D (old_hdr->result =3D=3D 0) ? 0 : -EIO;
 	sg_finish_rem_req(srp);
+	sg_remove_request(sfp, srp);
 	retval =3D count;
 free_old_hdr:
 	kfree(old_hdr);
@@ -575,6 +576,7 @@ sg_new_read(Sg_fd * sfp, char __user *buf, size_t count=
, Sg_request * srp)
 	}
 err_out:
 	err2 =3D sg_finish_rem_req(srp);
+	sg_remove_request(sfp, srp);
 	return err ? : err2 ? : count;
 }
=20
@@ -811,6 +813,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
 		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
 			"sg_common_write: start_req err=3D%d\n", k));
 		sg_finish_rem_req(srp);
+		sg_remove_request(sfp, srp);
 		return k;	/* probably out of space --> ENOMEM */
 	}
 	if (atomic_read(&sdp->detaching)) {
@@ -823,6 +826,7 @@ sg_common_write(Sg_fd * sfp, Sg_request * srp,
 		}
=20
 		sg_finish_rem_req(srp);
+		sg_remove_request(sfp, srp);
 		return -ENODEV;
 	}
=20
@@ -1312,6 +1316,7 @@ sg_rq_end_io_usercontext(struct work_struct *work)
 	struct sg_fd *sfp =3D srp->parentfp;
=20
 	sg_finish_rem_req(srp);
+	sg_remove_request(sfp, srp);
 	kref_put(&sfp->f_ref, sg_remove_sfp);
 }
=20
@@ -1856,8 +1861,6 @@ sg_finish_rem_req(Sg_request *srp)
 	else
 		sg_remove_scat(sfp, req_schp);
=20
-	sg_remove_request(sfp, srp);
-
 	return ret;
 }
=20
@@ -2204,12 +2207,17 @@ sg_remove_sfp_usercontext(struct work_struct *work)
 	struct sg_fd *sfp =3D container_of(work, struct sg_fd, ew.work);
 	struct sg_device *sdp =3D sfp->parentdp;
 	Sg_request *srp;
+	unsigned long iflags;
=20
 	/* Cleanup any responses which were never read(). */
+	write_lock_irqsave(&sfp->rq_list_lock, iflags);
 	while (!list_empty(&sfp->rq_list)) {
 		srp =3D list_first_entry(&sfp->rq_list, Sg_request, entry);
 		sg_finish_rem_req(srp);
+		list_del(&srp->entry);
+		srp->parentfp =3D NULL;
 	}
+	write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
=20
 	if (sfp->reserve.bufflen > 0) {
 		SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
--=20
2.14.1