lib: Fixed crash when closing a failed istream-concat

i_stream_concat_seek() could have set cur_input==NULL and we still attempted to seek the cur_input at close time.
dovecot · May 19, 2016 · ad66167 · ad66167
1 parent 4d30a2d
commit ad66167
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/lib/istream-concat.c b/src/lib/istream-concat.c
@@ -23,7 +23,10 @@ static void i_stream_concat_close(struct iostream_private *stream,
 	struct concat_istream *cstream = (struct concat_istream *)stream;
 	unsigned int i;
 
-	(void)i_stream_concat_skip(cstream);
+	if (cstream->istream.istream.stream_errno == 0) {
+		/* get the parent streams to the wanted offset */
+		(void)i_stream_concat_skip(cstream);
+	}
 
 	if (close_parent) {
 		for (i = 0; cstream->input[i] != NULL; i++)