diff options
| author | Gertjan van Wingerde <gwingerde@kpnplanet.nl> | 2008-06-06 20:54:28 (GMT) |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-06-14 16:17:57 (GMT) |
| commit | a26cbc650846b74dd7f46dd877fd30c472df14a1 (patch) | |
| tree | a31d96161b36ea6be4d84f1ad23c056f4b3323b7 /drivers/net/wireless/rt2x00/rt2500usb.c | |
| parent | 239c249d06b0c68ae06b10d9d6ad1f8e7f39452b (diff) | |
| download | linux-a26cbc650846b74dd7f46dd877fd30c472df14a1.tar.xz | |
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/rt2500usb.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2500usb.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c index 1bfb68a..9851cef 100644 --- a/drivers/net/wireless/rt2x00/rt2500usb.c +++ b/drivers/net/wireless/rt2x00/rt2500usb.c @@ -1156,14 +1156,10 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry, u32 word1; /* - * Copy descriptor to the skb->cb array, this has 2 benefits: - * 1) Each descriptor word is 4 byte aligned. - * 2) Descriptor is safe from moving of frame data in rt2x00usb. + * Copy descriptor to the skbdesc->desc buffer, making it safe from moving of + * frame data in rt2x00usb. */ - skbdesc->desc_len = - min_t(u16, entry->queue->desc_size, sizeof(entry->skb->cb)); - memcpy(entry->skb->cb, rxd, skbdesc->desc_len); - skbdesc->desc = entry->skb->cb; + memcpy(skbdesc->desc, rxd, skbdesc->desc_len); rxd = (__le32 *)skbdesc->desc; /* |