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| author | David S. Miller <davem@sunset.davemloft.net> | 2007-06-23 23:04:11 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-06-23 23:04:11 -0700 |
| commit | 7e4a6da7c2a1e0df06b71dc4ddc31910229ba9d9 (patch) | |
| tree | d08daa0a33f114428ffa65803f76f42c499e35c9 | |
| parent | 64beb8f3eb3c724add64ca3272915528e10213c1 (diff) | |
| download | linux-7e4a6da7c2a1e0df06b71dc4ddc31910229ba9d9.tar.bz2 | |
[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 <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ppp_mppe.c | 10 |
1 files 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 */ |