net: eepro100: validate various address valuesi(CVE-2021-20255)

fix CVE-2021-20255

patch link: https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06098.html

fix CVE-2021-20255, sync patch from ostms platform.

Signed-off-by: zhouli57 <zhouli57@huawei.com>
Signed-off-by: Yan Wang <wangyan122@huawei.com>
Signed-off-by: imxcc <xingchaochao@huawei.com>
(cherry picked from commit 3adeb3cd9d5cf3c2d32b4001e5d373779517b85c)

net-eepro100-validate-various-address-valuesi-CVE-20.patch

@@ -0,0 +1,58 @@
+From 5db012b1116d21c64da88ad206b3589ddf5f219b Mon Sep 17 00:00:00 2001
+From: zhouli57 <zhouli57@huawei.com>
+Date: Sat, 18 Dec 2021 09:39:57 +0800
+Subject: [PATCH] net: eepro100: validate various address
+ valuesi(CVE-2021-20255)
+
+fix CVE-2021-20255
+
+patch link: https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg06098.html
+
+fix CVE-2021-20255, sync patch from ostms platform.
+
+Signed-off-by: zhouli57 <zhouli57@huawei.com>
+Signed-off-by: Yan Wang <wangyan122@huawei.com>
+---
+ hw/net/eepro100.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+diff --git a/hw/net/eepro100.c b/hw/net/eepro100.c
+index 16e95ef9cc..2474cf3dc2 100644
+--- a/hw/net/eepro100.c
++++ b/hw/net/eepro100.c
+@@ -279,6 +279,9 @@ typedef struct {
+     /* Quasi static device properties (no need to save them). */
+     uint16_t stats_size;
+     bool has_extended_tcb_support;
++
++    /* Flag to avoid recursions. */
++    bool busy;
+ } EEPRO100State;
+ 
+ /* Word indices in EEPROM. */
+@@ -837,6 +840,14 @@ static void action_command(EEPRO100State *s)
+        Therefore we limit the number of iterations. */
+     unsigned max_loop_count = 16;
+ 
++    if (s->busy) {
++        /* Prevent recursions. */
++        logout("recursion in %s:%u\n", __FILE__, __LINE__);
++        return;
++    }
++
++    s->busy = true;
++
+     for (;;) {
+         bool bit_el;
+         bool bit_s;
+@@ -933,6 +944,7 @@ static void action_command(EEPRO100State *s)
+     }
+     TRACE(OTHER, logout("CU list empty\n"));
+     /* List is empty. Now CU is idle or suspended. */
++    s->busy = false;
+ }
+ 
+ static void eepro100_cu_command(EEPRO100State * s, uint8_t val)
+-- 
+2.27.0
+