From: Timo Sirainen <timo.sirainen@dovecot.fi>
Date: Sat, 15 Dec 2018 14:32:22 +0000 (+0200)
Subject: lib-mail: ostream-dot - Add asserts to make sure max_bytes doesn't underflow
X-Git-Tag: 2.3.5~18
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cc1c3fb1e40e408d33692ec6ccbd4978751f3949;p=thirdparty%2Fdovecot%2Fcore.git

lib-mail: ostream-dot - Add asserts to make sure max_bytes doesn't underflow
---

diff --git a/src/lib-mail/ostream-dot.c b/src/lib-mail/ostream-dot.c
index 6827cbdc01..3909801cae 100644
--- a/src/lib-mail/ostream-dot.c
+++ b/src/lib-mail/ostream-dot.c
@@ -167,6 +167,7 @@ o_stream_dot_sendv(struct ostream_private *stream,
 					iovn.iov_len = chunk;
 					array_append(&iov_arr, &iovn, 1);
 					data = p;
+					i_assert(max_bytes >= chunk);
 					max_bytes -= chunk;
 					sent += chunk;
 				}
@@ -175,6 +176,7 @@ o_stream_dot_sendv(struct ostream_private *stream,
 				iovn.iov_base = (add == '\r' ? "\r\n" : "..");
 				iovn.iov_len = 2;
 				array_append(&iov_arr, &iovn, 1);
+				i_assert(max_bytes >= 2);
 				max_bytes -= 2;
 				added++;
 				sent++;
@@ -189,6 +191,7 @@ o_stream_dot_sendv(struct ostream_private *stream,
 			iovn.iov_base = data;
 			iovn.iov_len = chunk;
 			array_append(&iov_arr, &iovn, 1);
+			i_assert(max_bytes >= chunk);
 			max_bytes -= chunk;
 			sent += chunk;
 		}