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CVE-2021-20255 patch adapted from QEMU patch by Stefan Weil
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1930646
Signed-off-by: Neha Agarwal <nehaagarwal@microsoft.com>
---
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)
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