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authorGertjan van Wingerde <gwingerde@kpnplanet.nl>2008-06-06 22:54:28 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-06-14 12:17:57 -0400
commita26cbc650846b74dd7f46dd877fd30c472df14a1 (patch)
treea31d96161b36ea6be4d84f1ad23c056f4b3323b7 /drivers/net/wireless/rt2x00/rt2x00usb.c
parent239c249d06b0c68ae06b10d9d6ad1f8e7f39452b (diff)
rt2x00: Fix double usage of skb->cb in USB RX path.
It is not safe to use the skb->cb area for both the rxd and skb_frame_desc data at the same time, while they occupy an overlapping piece of memory. This can lead to hard to trace crashes as pointers within skb_frame_desc are pointing into nowhere, or the rxd data is overwritten with non-sense. Fix it by copying the rxd to a small buffer on the stack. Signed-off-by: Gertjan van Wingerde <gwingerde@kpnplanet.nl> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00usb.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00usb.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 33833bc6d66..68d87f09e05 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -267,6 +267,7 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
struct sk_buff *skb;
struct skb_frame_desc *skbdesc;
struct rxdone_entry_desc rxdesc;
+ u8 rxd[32];
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
@@ -286,16 +287,13 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
skbdesc = get_skb_frame_desc(entry->skb);
memset(skbdesc, 0, sizeof(*skbdesc));
skbdesc->entry = entry;
+ skbdesc->desc = rxd;
+ skbdesc->desc_len = entry->queue->desc_size;
memset(&rxdesc, 0, sizeof(rxdesc));
rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
/*
- * Trim the skb to the correct size.
- */
- skb_trim(entry->skb, rxdesc.size);
-
- /*
* Allocate a new sk buffer to replace the current one.
* If allocation fails, we should drop the current frame
* so we can recycle the existing sk buffer for the new frame.