35 lines
1.4 KiB
Diff
35 lines
1.4 KiB
Diff
|
References: bsc#956832 CVE-2015-8345
|
||
|
|
|
||
|
|
From: Prasad J Pandit <address@hidden>
|
||
|
|
Date: Fri, 16 Oct 2015 11:33:27 +0530
|
||
|
|
Subject: eepro100: prevent an infinite loop over same command block
|
||
|
|
|
||
|
|
action_command() routine executes a chain of commands located
|
||
|
|
in the Command Block List(CBL). Each Command Block(CB) has a
|
||
|
|
link to the next CB in the list, given by 's->tx.link'.
|
||
|
|
This is used in conjunction with the base address 's->cu_base'.
|
||
|
|
|
||
|
|
An infinite loop unfolds if the 'link' to the next CB is
|
||
|
|
same as the previous one, the loop ends up executing the same
|
||
|
|
command over and over again.
|
||
|
|
|
||
|
|
Reported-by: Qinghao Tang <address@hidden>
|
||
|
|
Signed-off-by: Prasad J Pandit <address@hidden>
|
||
|
|
---
|
||
|
|
hw/net/eepro100.c | 2 ++
|
||
|
|
1 file changed, 2 insertions(+)
|
||
|
|
|
||
|
|
Index: xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/eepro100.c
|
||
|
|
===================================================================
|
||
|
|
--- xen-4.6.0-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/eepro100.c
|
||
|
|
+++ xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/eepro100.c
|
||
|
|
@@ -674,6 +674,8 @@ static void eepro100_cu_command(EEPRO100
|
||
|
|
next_command:
|
||
|
|
cb_address = s->cu_base + s->cu_offset;
|
||
|
|
cpu_physical_memory_read(cb_address, (uint8_t *) & tx, sizeof(tx));
|
||
|
|
+ if (tx.link == s->cu_offset)
|
||
|
|
+ break;
|
||
|
|
uint16_t status = le16_to_cpu(tx.status);
|
||
|
|
uint16_t command = le16_to_cpu(tx.command);
|
||
|
|
logout
|