linux-kernel - [012/103] HID: hidraw, fix a NULL pointer dereference in hidraw

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Message-Id: <20101022185228.402222397@clark.site>
Date:	Fri, 22 Oct 2010 11:50:46 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Antonio Ospite <ospite@...denti.unina.it>,
	Jiri Kosina <jkosina@...e.cz>
Subject: [012/103] HID: hidraw, fix a NULL pointer dereference in hidraw_write

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Antonio Ospite <ospite@...denti.unina.it>

commit e42dee9a99a3ecd32b5c027e8f7411fb5bc11eb6 upstream.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
IP: [<ffffffffa0f0a625>] hidraw_write+0x3b/0x116 [hid]
[...]

This is reproducible by disconnecting the device while userspace writes
to dev node in a loop and doesn't check return values in order to exit
the loop.

Signed-off-by: Antonio Ospite <ospite@...denti.unina.it>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hid/hidraw.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -111,6 +111,12 @@ static ssize_t hidraw_write(struct file
 	int ret = 0;
 
 	mutex_lock(&minors_lock);
+
+	if (!hidraw_table[minor]) {
+		ret = -ENODEV;
+		goto out;
+	}
+
 	dev = hidraw_table[minor]->hid;
 
 	if (!dev->hid_output_raw_report) {


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