[PATCH AUTOSEL 5.7 18/24] scsi: libfc: Free skb in fc_disc_gpn_id_resp() for valid cases

[Sasha Levin]

From: Javed Hasan <jhasan@xxxxxxxxxxx>

[ Upstream commit ec007ef40abb6a164d148b0dc19789a7a2de2cc8 ]

In fc_disc_gpn_id_resp(), skb is supposed to get freed in all cases except
for PTR_ERR. However, in some cases it didn't.

This fix is to call fc_frame_free(fp) before function returns.

Link: https://lore.kernel.org/r/20200729081824.30996-2-jhasan@xxxxxxxxxxx
Reviewed-by: Girish Basrur <gbasrur@xxxxxxxxxxx>
Reviewed-by: Santosh Vernekar <svernekar@xxxxxxxxxxx>
Reviewed-by: Saurav Kashyap <skashyap@xxxxxxxxxxx>
Reviewed-by: Shyam Sundar <ssundar@xxxxxxxxxxx>
Signed-off-by: Javed Hasan <jhasan@xxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/scsi/libfc/fc_disc.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index 2b865c6423e29..e00dc4693fcbd 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -581,8 +581,12 @@ static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
 
 	if (PTR_ERR(fp) == -FC_EX_CLOSED)
 		goto out;
-	if (IS_ERR(fp))
-		goto redisc;
+	if (IS_ERR(fp)) {
+		mutex_lock(&disc->disc_mutex);
+		fc_disc_restart(disc);
+		mutex_unlock(&disc->disc_mutex);
+		goto out;
+	}
 
 	cp = fc_frame_payload_get(fp, sizeof(*cp));
 	if (!cp)
@@ -609,7 +613,7 @@ static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
 				new_rdata->disc_id = disc->disc_id;
 				fc_rport_login(new_rdata);
 			}
-			goto out;
+			goto free_fp;
 		}
 		rdata->disc_id = disc->disc_id;
 		mutex_unlock(&rdata->rp_mutex);
@@ -626,6 +630,8 @@ static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
 		fc_disc_restart(disc);
 		mutex_unlock(&disc->disc_mutex);
 	}
+free_fp:
+	fc_frame_free(fp);
 out:
 	kref_put(&rdata->kref, fc_rport_destroy);
 	if (!IS_ERR(fp))
-- 
2.25.1