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ide: ahci: reset ncq object to unused on error

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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>
This commit is contained in:
Prasad J Pandit 2016-01-11 14:10:42 -05:00 committed by John Snow
parent 97225170f6
commit 4ab0359a8a
1 changed files with 1 additions and 0 deletions
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hw/ide/ahci.c
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@ -910,6 +910,7 @@ 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_finish(NCQTransferState *ncq_tfs)