diff --git a/0002-Skip-empty-write-buffers-when-unserializing-parser.patch b/0002-Skip-empty-write-buffers-when-unserializing-parser.patch
new file mode 100644
index 0000000..ffdb18d
--- /dev/null
+++ b/0002-Skip-empty-write-buffers-when-unserializing-parser.patch
@@ -0,0 +1,74 @@
+From cd919def3bf5efeae24976752143cefc9ffc58fa Mon Sep 17 00:00:00 2001
+From: Michael Hanselmann <public@hansmi.ch>
+Date: Sun, 22 Aug 2021 21:07:36 +0200
+Subject: [PATCH] Skip empty write buffers when unserializing parser
+
+At commit 8490a7ac101d the following `fuzzing/usbredirparserfuzz` input causes
+the instantiation of empty write buffers:
+
+$ base64 -d <<'EOF' > testcase6474540506021888
+QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAG
+AAAAAN7/AAAACAA=
+EOF
+
+Empty write buffers trigger all kinds of issues, in part because they cause
+calls to write(2) with a zero length.
+
+Signed-off-by: Michael Hanselmann <public@hansmi.ch>
+---
+ usbredirparser/usbredirparser.c | 26 ++++++++++++++++++++++----
+ 1 file changed, 22 insertions(+), 4 deletions(-)
+
+diff --git a/usbredirparser/usbredirparser.c b/usbredirparser/usbredirparser.c
+index edfdfd2..f08a43a 100644
+--- a/usbredirparser/usbredirparser.c
++++ b/usbredirparser/usbredirparser.c
+@@ -1673,6 +1673,12 @@ int usbredirparser_unserialize(struct usbredirparser *parser_pub,
+         return -1;
+     }
+ 
++    if (parser->write_buf_count != 0 || parser->write_buf != NULL ||
++        parser->data != NULL) {
++        ERROR("unserialization must use a pristine parser");
++        return -1;
++    }
++
+     if (unserialize_int(parser, &state, &remain, &i, "length"))
+         return -1;
+     if (i != len) {
+@@ -1763,16 +1769,28 @@ int usbredirparser_unserialize(struct usbredirparser *parser_pub,
+         return -1;
+     next = &parser->write_buf;
+     while (i) {
++        uint8_t *buf = NULL;
++
++        l = 0;
++        if (unserialize_data(parser, &state, &remain, &buf, &l, "wbuf")) {
++            return -1;
++        }
++
++        if (l == 0) {
++            free(buf);
++            ERROR("write buffer %d is empty", i);
++            return -1;
++        }
++
+         wbuf = calloc(1, sizeof(*wbuf));
+         if (!wbuf) {
++            free(buf);
+             ERROR("Out of memory allocating unserialize buffer");
+             return -1;
+         }
+-        *next = wbuf;
+-        l = 0;
+-        if (unserialize_data(parser, &state, &remain, &wbuf->buf, &l, "wbuf"))
+-            return -1;
++        wbuf->buf = buf;
+         wbuf->len = l;
++        *next = wbuf;
+         next = &wbuf->next;
+         i--;
+     }
+-- 
+1.8.3.1
+
diff --git a/0003-Update-write-buffer-count-during-deserialization.patch b/0003-Update-write-buffer-count-during-deserialization.patch
new file mode 100644
index 0000000..7b2be42
--- /dev/null
+++ b/0003-Update-write-buffer-count-during-deserialization.patch
@@ -0,0 +1,64 @@
+From b6ef53f4f4925d3aa71dc1cb828c311d0caa3c24 Mon Sep 17 00:00:00 2001
+From: Michael Hanselmann <public@hansmi.ch>
+Date: Sun, 22 Aug 2021 21:34:13 +0200
+Subject: [PATCH] Update write buffer count during deserialization
+
+At commit 8490a7ac the following `fuzzing/usbredirparserfuzz` input causes
+an integer underflow on write_buf_count as it's not updated during
+deserialization:
+
+```
+$ base64 -d <<'EOF' | gunzip -c > testcase6250181968920576
+H4sIAMChImECAzNkwA0YgZgTxPiPBGCSAkgK07b9YgPRLDA+EBvNYoPLuzDg
+A3Cj3/xHBTc5IPJgFQz/vwNJznSGBIYQIBtJPxN29n842xbhaohtaXA7GX4z
+fHsPFNVmYHiI4S8jBiKAADbfAEMOaEkCMEDArv6fBpX4gzMM/6OoxxHOWMMO
+YjYiIFleosvhsxcD/IYofY/dW0AD/xPy1nWc3kpDTUsEnYPD+UQEPzHuxB78
+qWDwn0pgP8k6UvGDq0Alu7Foe0+0BYygEDBg+LwtAZhdAUAa2Kf/AwAA
+EOF
+```
+
+Signed-off-by: Michael Hanselmann <public@hansmi.ch>
+---
+ usbredirparser/usbredirparser.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/usbredirparser/usbredirparser.c b/usbredirparser/usbredirparser.c
+index f08a43a..67303d0 100644
+--- a/usbredirparser/usbredirparser.c
++++ b/usbredirparser/usbredirparser.c
+@@ -20,6 +20,7 @@
+ */
+ #include "config.h"
+ 
++#include <assert.h>
+ #include <stddef.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+@@ -1059,6 +1060,8 @@ int usbredirparser_do_write(struct usbredirparser *parser_pub)
+     int w, ret = 0;
+ 
+     LOCK(parser);
++    assert((parser->write_buf_count != 0) ^ (parser->write_buf == NULL));
++
+     for (;;) {
+         wbuf = parser->write_buf;
+         if (!wbuf)
+@@ -1763,6 +1766,7 @@ int usbredirparser_unserialize(struct usbredirparser *parser_pub,
+     if (unserialize_data(parser, &state, &remain, &parser->data, &i, "data"))
+         return -1;
+     parser->data_read = i;
++    parser->write_buf_count = 0;
+ 
+     /* Get the write buffer count and the write buffers */
+     if (unserialize_int(parser, &state, &remain, &i, "write_buf_count"))
+@@ -1792,6 +1796,7 @@ int usbredirparser_unserialize(struct usbredirparser *parser_pub,
+         wbuf->len = l;
+         *next = wbuf;
+         next = &wbuf->next;
++        parser->write_buf_count++;
+         i--;
+     }
+ 
+-- 
+1.8.3.1
+
diff --git a/usbredir.spec b/usbredir.spec
index c603f1c..98ca8ca 100644
--- a/usbredir.spec
+++ b/usbredir.spec
@@ -1,6 +1,6 @@
 Name:           usbredir
 Version:        0.8.0
-Release:        5
+Release:        6
 Summary:        network protocol libraries for sending USB device traffic
 License:        LGPLv2+ and GPLv2+
 URL:            https://www.spice-space.org/usbredir.html
@@ -12,6 +12,8 @@ Provides:       %{name}-server
 Obsoletes:      %{name}-server
 
 Patch1:		0001-CVE-2021-3700.patch
+Patch2:		0002-Skip-empty-write-buffers-when-unserializing-parser.patch
+Patch3:		0003-Update-write-buffer-count-during-deserialization.patch
 
 %description
 usbredir is the name of a network protocol for sending USB device traffic over
@@ -68,6 +70,9 @@ make %{?_smp_mflags} V=1
 
 
 %changelog
+* Tue Dec 07 2021 wuguanghao <wuguanghao3@hauwei.com> - 0.8.0-6
+- fix timeout and abort of fuzz-test
+
 * Thu Sep 23 2021 yanglongkang <yanglongkang@hauwei.com> - 0.8.0-5
 - fix CVE-2021-3700