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Commit 0f1db7de authored by Al Viro's avatar Al Viro
Browse files

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.
parent 67e808fb
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+8 −0
Original line number Diff line number Diff line
@@ -1583,6 +1583,10 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
			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_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
			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);