From: Bart Van Assche <bvanassche@acm.org>
Date: Tue, 18 Sep 2018 01:10:05 +0000 (-0700)
Subject: IB/srp: Avoid that sg_reset -d ${srp_device} triggers an infinite loop
X-Git-Tag: v4.9.131~24
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94b7698c3d23e90c24b89bd7e6b5ab578fc8620c;p=linux

IB/srp: Avoid that sg_reset -d ${srp_device} triggers an infinite loop

commit ee92efe41cf358f4b99e73509f2bfd4733609f26 upstream.

Use different loop variables for the inner and outer loop. This avoids
that an infinite loop occurs if there are more RDMA channels than
target->req_ring_size.

Fixes: d92c0da71a35 ("IB/srp: Add multichannel support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 463ea592a42a..646359025574 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -2639,7 +2639,7 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
 {
 	struct srp_target_port *target = host_to_target(scmnd->device->host);
 	struct srp_rdma_ch *ch;
-	int i;
+	int i, j;
 	u8 status;
 
 	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
@@ -2653,8 +2653,8 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
 
 	for (i = 0; i < target->ch_count; i++) {
 		ch = &target->ch[i];
-		for (i = 0; i < target->req_ring_size; ++i) {
-			struct srp_request *req = &ch->req_ring[i];
+		for (j = 0; j < target->req_ring_size; ++j) {
+			struct srp_request *req = &ch->req_ring[j];
 
 			srp_finish_req(ch, req, scmnd->device, DID_RESET << 16);
 		}