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From 5209fbd340efe3fa7f8ea82f671db2fa04dda19b Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Tue, 23 Feb 2021 15:20:03 +0800
Subject: [PATCH] ide:atapi: check io_buffer_index in ide_atapi_cmd_reply_end
Fix CVE-2020-29443
During data transfer via packet command in 'ide_atapi_cmd_reply_end'
's->io_buffer_index' could exceed the 's->io_buffer' length, leading
to OOB access issue. Add check to avoid it.
...
#9 ahci_pio_transfer ../hw/ide/ahci.c:1383
#10 ide_transfer_start_norecurse ../hw/ide/core.c:553
#11 ide_atapi_cmd_reply_end ../hw/ide/atapi.c:284
#12 ide_atapi_cmd_read_pio ../hw/ide/atapi.c:329
#13 ide_atapi_cmd_read ../hw/ide/atapi.c:442
#14 cmd_read ../hw/ide/atapi.c:988
#15 ide_atapi_cmd ../hw/ide/atapi.c:1352
#16 ide_transfer_start ../hw/ide/core.c:561
#17 cmd_packet ../hw/ide/core.c:1729
#18 ide_exec_cmd ../hw/ide/core.c:2107
#19 handle_reg_h2d_fis ../hw/ide/ahci.c:1267
#20 handle_cmd ../hw/ide/ahci.c:1318
#21 check_cmd ../hw/ide/ahci.c:592
#22 ahci_port_write ../hw/ide/ahci.c:373
#23 ahci_mem_write ../hw/ide/ahci.c:513
Reported-by: Wenxiang Qian <leonwxqian@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
---
hw/ide/atapi.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 1b0f66cc08..fc9dc87f03 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -300,6 +300,9 @@ void ide_atapi_cmd_reply_end(IDEState *s)
s->packet_transfer_size -= size;
s->elementary_transfer_size -= size;
s->io_buffer_index += size;
+ if (s->io_buffer_index > s->io_buffer_total_len) {
+ return;
+ }
/* Some adapters process PIO data right away. In that case, we need
* to avoid mutual recursion between ide_transfer_start
--
2.27.0
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