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[PATCH] CAN-2005-0384: Remote Linux DoS on ppp servers

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Martin Schulze writes:

> Ben Martel and Stephen Blackheath have discovered a denial-of-service attack
> that a client of pppd can make that can hang the server machine.  The bug is
> in the Linux kernel 2.6 (tested on 2.6.9), but it looks like it also exists
> in the 2.4 series.

Yes, this is my bug. :(

I would just do this instead:

Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
paulus@au1.ibm.com 2005-03-15 15:38:47 -08:00 committed by Greg KH
parent 502f3a97bd
commit 7a5be74f06
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ppp_async.c
View file

@ -1000,7 +1000,7 @@ static void async_lcp_peek(struct asyncppp *ap, unsigned char *data,
data += 4;
dlen -= 4;
/* data[0] is code, data[1] is length */
while (dlen >= 2 && dlen >= data[1]) {
while (dlen >= 2 && dlen >= data[1] && data[1] >= 2) {
switch (data[0]) {
case LCP_MRU:
val = (data[2] << 8) + data[3];