[PATCH 2.6.22.3] ppp: fix output buffer size in ppp_decompress_frame

[Konstantin Sharlaimov <konstantin.sharlaimov@gmail.com>]

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.

Signed-off-by: Konstantin Sharlaimov <konstantin.sharlaimov@gmail.com>
---
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.

--- linux-2.6.21.3/drivers/net/ppp_generic.c.orig	2007-08-17 20:35:03.000000000 +1100
+++ linux-2.6.21.3/drivers/net/ppp_generic.c	2007-08-17 20:35:45.000000000 +1100
@@ -1726,7 +1726,7 @@ ppp_decompress_frame(struct ppp *ppp, st
 		}
 		/* 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. */

-
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