[PPP]: Fix output buffer size in ppp_decompress_frame().

This patch addresses the issue with "osize too small" errors in mppe
encryption.  The patch fixes the issue with wrong output buffer size
being passed to ppp decompression routine.

--------------------
As pointed out by Suresh Mahalingam, the issue addressed by
ppp-fix-osize-too-small-errors-when-decoding patch is not fully resolved yet.
The size of allocated output buffer is correct, however it size passed to
ppp->rcomp->decompress in ppp_generic.c if wrong. The patch fixes that.
--------------------

Signed-off-by: Konstantin Sharlaimov <konstantin.sharlaimov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 802f249b87c81926a0a911f3dcea622caf795c9c..80ff42d3e1c97e7899370cb5719652f37366f77d 100644 (file)
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -1739,7 +1739,7 @@ ppp_decompress_frame(struct ppp *ppp, struct sk_buff *skb)
                }
                /* the decompressor still expects the A/C bytes in the hdr */
                len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
-                               skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN);
+                               skb->len + 2, ns->data, obuff_size);
                if (len < 0) {
                        /* Pass the compressed frame to pppd as an
                           error indication. */