[PATCH] Check character flags in ppp_async ldisc

Although it was checking the per-character error flags supplied by the
driver for ordinary characters, the ppp_async line discipline code wasn't
checking the flags for special characters, such as the flag and escape
characters (~ and }).  This patch adds that check.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/net/ppp_async.c

@@ -911,7 +911,9 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
 			break;
 
 		c = buf[n];
-		if (c == PPP_FLAG) {
+		if (flags != NULL && flags[n] != 0) {
+			ap->state |= SC_TOSS;
+		} else if (c == PPP_FLAG) {
 			process_input_packet(ap);
 		} else if (c == PPP_ESCAPE) {
 			ap->state |= SC_ESCAPE;