9p: cope with bogus responses from server in p9_client_{read,write}
if server claims to have written/read more than we'd told it to,
warn and cap the claimed byte count to avoid advancing more than
we are ready to.
diff --git a/net/9p/client.c b/net/9p/client.c
index 81925b9..498454b 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1583,6 +1583,10 @@
p9_free_req(clnt, req);
break;
}
+ if (rsize < count) {
+ pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
+ count = rsize;
+ }
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
if (!count) {
@@ -1650,6 +1654,10 @@
p9_free_req(clnt, req);
break;
}
+ if (rsize < count) {
+ pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
+ count = rsize;
+ }
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);