From 7e4a6da7c2a1e0df06b71dc4ddc31910229ba9d9 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 23 Jun 2007 23:04:11 -0700 Subject: [PATCH] [PPP]: Revert 606f585e363527da9feaed79465132c0c661fd9e This can cause packet buffer overflows in certain cases, the real bug will be fixed differently in a followon changeset. Signed-off-by: David S. Miller --- drivers/net/ppp_mppe.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ppp_mppe.c b/drivers/net/ppp_mppe.c index 5ae80bbe2edc..d5bdd2574659 100644 --- a/drivers/net/ppp_mppe.c +++ b/drivers/net/ppp_mppe.c @@ -493,14 +493,14 @@ mppe_decompress(void *arg, unsigned char *ibuf, int isize, unsigned char *obuf, /* * Make sure we have enough room to decrypt the packet. - * To account for possible PFC we should only subtract 1 - * byte whereas in mppe_compress() we added 2 bytes (+MPPE_OVHD); - * However, we assume no PFC, thus subtracting 2 bytes. + * Note that for our test we only subtract 1 byte whereas in + * mppe_compress() we added 2 bytes (+MPPE_OVHD); + * this is to account for possible PFC. */ - if (osize < isize - MPPE_OVHD - 2) { + if (osize < isize - MPPE_OVHD - 1) { printk(KERN_DEBUG "mppe_decompress[%d]: osize too small! " "(have: %d need: %d)\n", state->unit, - osize, isize - MPPE_OVHD - 2); + osize, isize - MPPE_OVHD - 1); return DECOMP_ERROR; } osize = isize - MPPE_OVHD - 2; /* assume no PFC */ -- 2.20.1