linux-kernel - [21/40] drivers/usb/class/cdc-acm.c: clear dangling pointer

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Date:	Tue, 10 Jan 2012 13:45:34 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Julia Lawall <julia@...u.dk>,
	Oliver Neukum <oneukum@...e.de>
Subject: [21/40] drivers/usb/class/cdc-acm.c: clear dangling pointer

3.0-stable review patch.  If anyone has any objections, please let me know.

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

From: Julia Lawall <julia@...u.dk>

commit e7c8e8605d0bafc705ff27f9da98a1668427cc0f upstream.

On some failures, the country_code field of an acm structure is freed
without freeing the acm structure itself.  Elsewhere, operations including
memcpy and kfree are performed on the country_code field.  The patch sets
the country_code field to NULL when it is freed, and likewise sets the
country_code_size field to 0.

Signed-off-by: Julia Lawall <julia@...u.dk>
Acked-by: Oliver Neukum <oneukum@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/class/cdc-acm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1183,6 +1183,8 @@ made_compressed_probe:
 		i = device_create_file(&intf->dev, &dev_attr_wCountryCodes);
 		if (i < 0) {
 			kfree(acm->country_codes);
+			acm->country_codes = NULL;
+			acm->country_code_size = 0;
 			goto skip_countries;
 		}
 
@@ -1191,6 +1193,8 @@ made_compressed_probe:
 		if (i < 0) {
 			device_remove_file(&intf->dev, &dev_attr_wCountryCodes);
 			kfree(acm->country_codes);
+			acm->country_codes = NULL;
+			acm->country_code_size = 0;
 			goto skip_countries;
 		}
 	}


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