linux-kernel - [PATCH] tty: mxser: fix cycle termination condition in mxser_probe() and mxser_module

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Date:	Sun,  7 Apr 2013 23:46:47 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] tty: mxser: fix cycle termination condition in mxser_probe() and mxser_module_init()

There is a bug in resources deallocation code in mxser_probe() and mxser_module_init().
As soon as variable 'i' is unsigned int, cycle termination condition i >= 0 is always true.
The patch fixes the issue.

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/tty/mxser.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 484b6a3..302909c 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2643,9 +2643,9 @@ static int mxser_probe(struct pci_dev *pdev,
 				mxvar_sdriver, brd->idx + i, &pdev->dev);
 		if (IS_ERR(tty_dev)) {
 			retval = PTR_ERR(tty_dev);
-			for (i--; i >= 0; i--)
+			for (; i > 0; i--)
 				tty_unregister_device(mxvar_sdriver,
-					brd->idx + i);
+					brd->idx + i - 1);
 			goto err_relbrd;
 		}
 	}
@@ -2751,9 +2751,9 @@ static int __init mxser_module_init(void)
 			tty_dev = tty_port_register_device(&brd->ports[i].port,
 					mxvar_sdriver, brd->idx + i, NULL);
 			if (IS_ERR(tty_dev)) {
-				for (i--; i >= 0; i--)
+				for (; i > 0; i--)
 					tty_unregister_device(mxvar_sdriver,
-						brd->idx + i);
+						brd->idx + i - 1);
 				for (i = 0; i < brd->info->nports; i++)
 					tty_port_destroy(&brd->ports[i].port);
 				free_irq(brd->irq, brd);
-- 
1.7.9.5

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