usbredirparser: reset parser's fields on unserialize

This is a followup from previous commit and fixes the following leak.

 | 104 (24 direct, 80 indirect) bytes in 1 blocks are definitely lost in loss record 15 of 19
 |    at 0x484A464: calloc (vg_replace_malloc.c:1328)
 |    by 0x485A238: usbredirparser_queue (usbredirparser.c:1235)
 |    by 0x485A571: usbredirparser_init (usbredirparser.c:227)
 |    by 0x40130B: get_usbredirparser (serializer.c:77)
 |    by 0x401379: simple (serializer.c:95)
 |    by 0x48FA3DD: ??? (in /usr/lib64/libglib-2.0.so.0.7200.2)
 |    by 0x48FA144: ??? (in /usr/lib64/libglib-2.0.so.0.7200.2)
 |    by 0x48FA8E1: g_test_run_suite (in /usr/lib64/libglib-2.0.so.0.7200.2)
 |    by 0x48FA94C: g_test_run (in /usr/lib64/libglib-2.0.so.0.7200.2)
 |    by 0x401161: main (serializer.c:112)
 |
 | LEAK SUMMARY:
 |    definitely lost: 24 bytes in 1 blocks
 |    indirectly lost: 80 bytes in 1 blocks
 |      possibly lost: 0 bytes in 0 blocks
 |    still reachable: 25,500 bytes in 17 blocks
 |         suppressed: 0 bytes in 0 blocks
 | Reachable blocks (those to which a pointer was found) are not shown.
 | To see them, rerun with: --leak-check=full --show-leak-kinds=all

Signed-off-by: Victor Toso <victortoso@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/usbredirparser/usbredirparser.c b/usbredirparser/usbredirparser.c
index a5dd0e7..9bfc27c 100644
--- a/usbredirparser/usbredirparser.c
+++ b/usbredirparser/usbredirparser.c
@@ -1823,6 +1823,21 @@ int usbredirparser_unserialize(struct usbredirparser *parser_pub,
         return -1;
     }
 
+    {
+        /* We need to reset parser's state to receive unserialized
+         * data. */
+        struct usbredirparser_buf *wbuf = parser->write_buf;
+        while (wbuf) {
+            struct usbredirparser_buf *next_wbuf = wbuf->next;
+            free(wbuf->buf);
+            free(wbuf);
+            wbuf = next_wbuf;
+        }
+        parser->write_buf = NULL;
+        parser->write_buf_count = 0;
+        parser->write_buf_total_size = 0;
+    }
+
     if (unserialize_int(parser, &state, &remain, &i, "length")) {
         usbredirparser_assert_invariants(parser);
         return -1;