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authorPaul Mackerras <paulus@samba.org>2007-04-19 13:05:52 -0700
committerDavid S. Miller <davem@davemloft.net>2007-04-19 13:05:52 -0700
commit7c5050e3e49f6d89af0d63111611693d9625d1f5 (patch)
tree739b5eb674a433077fb3486f7c305ca1720b3215
parent895e1fc7226e6732bc77138955b6c7dfa279f57a (diff)
downloadlinux-7c5050e3e49f6d89af0d63111611693d9625d1f5.tar.bz2
[PPP]: Fix skbuff.c:BUG due incorrect logic in process_input_packet()
From: Paul Mackerras <paulus@samba.org> This fixes: Subject: kernel BUG at net/core/skbuff.c in linux-2.6.21-rc6 process_input_packet() treats the case where the first byte is 0xff (PPP_ALLSTATIONS) but the second byte is 0x03 (PPP_UI) as indicating a packet with a PPP protocol number of 0xff. Arguably that's wrong since PPP protocol 0xff is reserved, and the RFC does envision the possibility of receiving frames where the control field has values other than 0x03. Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ppp_async.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c
index 933e2f3c77aa..caabbc408c34 100644
--- a/drivers/net/ppp_async.c
+++ b/drivers/net/ppp_async.c
@@ -802,9 +802,9 @@ process_input_packet(struct asyncppp *ap)
/* check for address/control and protocol compression */
p = skb->data;
- if (p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
+ if (p[0] == PPP_ALLSTATIONS) {
/* chop off address/control */
- if (skb->len < 3)
+ if (p[1] != PPP_UI || skb->len < 3)
goto err;
p = skb_pull(skb, 2);
}