linux-kernel - [patch] pcmcia: fix error handling in cm4000

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Message-ID: <20100418190732.GA7920@bicker>
Date:	Sun, 18 Apr 2010 22:07:33 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Harald Welte <laforge@...monks.org>
Cc:	Dominik Brodowski <linux@...inikbrodowski.net>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roel Kluin <roel.kluin@...il.com>,
	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] pcmcia: fix error handling in cm4000_cs.c

In the original code we used -ENODEV as the number of bytes to
copy_to_user() and we didn't release the locks.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
index c9bc896..90b199f 100644
--- a/drivers/char/pcmcia/cm4000_cs.c
+++ b/drivers/char/pcmcia/cm4000_cs.c
@@ -1026,14 +1026,16 @@ static ssize_t cmm_read(struct file *filp, __user char *buf, size_t count,
 
 	xoutb(0, REG_FLAGS1(iobase));	/* clear detectCMM */
 	/* last check before exit */
-	if (!io_detect_cm4000(iobase, dev))
-		count = -ENODEV;
+	if (!io_detect_cm4000(iobase, dev)) {
+		rc = -ENODEV;
+		goto release_io;
+	}
 
 	if (test_bit(IS_INVREV, &dev->flags) && count > 0)
 		str_invert_revert(dev->rbuf, count);
 
 	if (copy_to_user(buf, dev->rbuf, count))
-		return -EFAULT;
+		rc = -EFAULT;
 
 release_io:
 	clear_bit(LOCK_IO, &dev->flags);
--
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