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authorPrasad J Pandit <pjp@fedoraproject.org>2016-01-11 14:10:42 -0500
committerJohn Snow <jsnow@redhat.com>2016-01-11 14:10:42 -0500
commit4ab0359a8ae182a7ac5c99609667273167703fab (patch)
treeeef66e493a427e7af812f86ca33cd8a21c0ba36e
parent97225170f6ee6d0ad8653916c7a5e4508cbffc18 (diff)
downloadqemu-arm-4ab0359a8ae182a7ac5c99609667273167703fab.tar.gz
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>
-rw-r--r--hw/ide/ahci.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index dd1912e80d..17f1cbd930 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -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)