linux-kernel - [PATCH][V2] isci: Fix infinite loop in while loop

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Message-Id: <20180420095716.2143-1-colin.king@canonical.com>
Date:   Fri, 20 Apr 2018 10:57:16 +0100
From:   Colin King <colin.king@...onical.com>
To:     Intel SCU Linux support <intel-linux-scu@...el.com>,
        Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][V2] isci: Fix infinite loop in while loop

From: Colin Ian King <colin.king@...onical.com>

In the case when the phy_mask is bitwise anded with the
phy_index bit is zero the continue statement currently jumps
to the next iteration of the while loop and phy_index is
never actually incremented, potentially causing an infinite
loop if phy_index is less than SCI_MAX_PHS. Fix this by turning
the while loop into a for loop.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/scsi/isci/port_config.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/isci/port_config.c b/drivers/scsi/isci/port_config.c
index edb7be786c65..9e8de1462593 100644
--- a/drivers/scsi/isci/port_config.c
+++ b/drivers/scsi/isci/port_config.c
@@ -291,7 +291,7 @@ sci_mpc_agent_validate_phy_configuration(struct isci_host *ihost,
 		 * Note: We have not moved the current phy_index so we will actually
 		 *       compare the startting phy with itself.
 		 *       This is expected and required to add the phy to the port. */
-		while (phy_index < SCI_MAX_PHYS) {
+		for (; phy_index < SCI_MAX_PHYS; phy_index++) {
 			if ((phy_mask & (1 << phy_index)) == 0)
 				continue;
 			sci_phy_get_sas_address(&ihost->phys[phy_index],
@@ -311,7 +311,6 @@ sci_mpc_agent_validate_phy_configuration(struct isci_host *ihost,
 					      &ihost->phys[phy_index]);
 
 			assigned_phy_mask |= (1 << phy_index);
-			phy_index++;
 		}
 
 	}
-- 
2.17.0