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| author | Konstantin Sharlaimov <konstantin.sharlaimov@gmail.com> | 2007-06-12 14:16:59 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-06-12 14:16:59 -0700 |
| commit | 606f585e363527da9feaed79465132c0c661fd9e (patch) | |
| tree | 1a4b22b46173ba2104211e54aa65375b25da5c65 | |
| parent | 9cadcd28f05e1957a8f61ae726fce31d0b29a3f9 (diff) | |
| download | blackbird-op-linux-606f585e363527da9feaed79465132c0c661fd9e.tar.gz blackbird-op-linux-606f585e363527da9feaed79465132c0c661fd9e.zip | |
[PPP_MPPE]: Fix "osize too small" check.
Prevent mppe_decompress() from generating "osize too small" errors when
checking for output buffer size. When receiving a packet of mru size the
output buffer for decrypted data is 1 byte too small since
mppe_decompress() tries to account for possible PFC, however later in code
it is assumed no PFC.
Adjusting the check prevented these errors from occurring.
Signed-off-by: Konstantin Sharlaimov <konstantin.sharlaimov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 d5bdd2574659..5ae80bbe2edc 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. - * 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. + * 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. */ - if (osize < isize - MPPE_OVHD - 1) { + if (osize < isize - MPPE_OVHD - 2) { printk(KERN_DEBUG "mppe_decompress[%d]: osize too small! " "(have: %d need: %d)\n", state->unit, - osize, isize - MPPE_OVHD - 1); + osize, isize - MPPE_OVHD - 2); return DECOMP_ERROR; } osize = isize - MPPE_OVHD - 2; /* assume no PFC */ |
