File 0218-ide-ahci-reset-ncq-object-to-unused.patch of Package qemu.4227

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File 0218-ide-ahci-reset-ncq-object-to-unused.patch of Package qemu.4227

From 14a35733ed0ef2b32e0faa3c51a0fac52166523a Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Mon, 11 Jan 2016 14:10:42 -0500
Subject: [PATCH] ide: ahci: reset ncq object to unused on error

When processing NCQ commands, AHCI device emulation prepares a
NCQ transfer object; To which an aio control block(aiocb) object
is assigned in 'execute_ncq_command'. In case, when the NCQ
command is invalid, the 'aiocb' object is not assigned, and NCQ
transfer object is left as 'used'. This leads to a use after
free kind of error in 'bdrv_aio_cancel_async' via 'ahci_reset_port'.
Reset NCQ transfer object to 'unused' to avoid it.

[Maintainer edit: s/ACHI/AHCI/ in the commit message. --js]

Reported-by: Qinghao Tang <luodalongde@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1452282511-4116-1-git-send-email-ppandit@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
(cherry picked from commit 4ab0359a8ae182a7ac5c99609667273167703fab)
[LM: BSC#961333 CVE-2016-1568]
Signed-off-by: Lin Ma <lma@suse.com>
---
 hw/ide/ahci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 31c0548bc8..94d90c490d 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -722,6 +722,7 @@ static void ncq_err(NCQTransferState *ncq_tfs)
     ide_state->error = ABRT_ERR;
     ide_state->status = READY_STAT | ERR_STAT;
     ncq_tfs->drive->port_regs.scr_err |= (1 << ncq_tfs->tag);
+    ncq_tfs->used = 0;
 }
 
 static void ncq_cb(void *opaque, int ret)

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File 0218-ide-ahci-reset-ncq-object-to-unused.patch of Package qemu.4227

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