Re: kernel BUG at net/core/skbuff.c in linux-2.6.21-rc6

David Miller
2007-04-14T17:04:51Z

From: Paul Mackerras <paulus@samba.org>
Date: Sun, 15 Apr 2007 02:49:28 +1000

> I didn't see the patch (the message that this is a reply to is the
> first one that I have seen in this thread), so I can't comment on it.

Here is Patrick McHardy's patch:

diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c
index 933e2f3..c68e37f 100644
--- a/drivers/net/ppp_async.c
+++ b/drivers/net/ppp_async.c
@@ -890,6 +890,8 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
ap->rpkt = skb;
}
if (skb->len == 0) {
+ int headroom = 0;
+
/* Try to get the payload 4-byte aligned.
* This should match the
* PPP_ALLSTATIONS/PPP_UI/compressed tests in
@@ -897,7 +899,10 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
* enough chars here to test buf[1] and buf[2].
*/
if (buf[0] != PPP_ALLSTATIONS)
- skb_reserve(skb, 2 + (buf[0] & 1));
+ headroom += 2;
+ if (buf[0] & 1)
+ headroom += 1;
+ skb_reserve(skb, headroom);
}
if (n > skb_tailroom(skb)) {
/* packet overflowed MRU */