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

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Date:	Sat, 14 Apr 2007 10:04:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	paulus@...ba.org
Cc:	kaber@...sh.net, poemann@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: kernel BUG at net/core/skbuff.c in linux-2.6.21-rc6

From: Paul Mackerras <paulus@...ba.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 */
-
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