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hw/nvme: fix aio cancel in flush

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Make sure that iocb->aiocb is NULL'ed when cancelling.

Fix a potential use-after-free by removing the bottom half and enqueuing
the completion directly.

Fixes: 38f4ac65ac ("hw/nvme: reimplement flush to allow cancellation")
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
This commit is contained in:
Klaus Jensen 2022-11-10 07:59:44 +01:00
parent 433c71e494
commit 3dbc1708ea
1 changed files with 6 additions and 15 deletions
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21
hw/nvme/ctrl.c
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@ -3160,7 +3160,6 @@ typedef struct NvmeFlushAIOCB {
BlockAIOCB common;
BlockAIOCB *aiocb;
NvmeRequest *req;
QEMUBH *bh;
int ret;
NvmeNamespace *ns;
@ -3176,6 +3175,7 @@ static void nvme_flush_cancel(BlockAIOCB *acb)
if (iocb->aiocb) {
blk_aio_cancel_async(iocb->aiocb);
iocb->aiocb = NULL;
}
}
@ -3185,6 +3185,8 @@ static const AIOCBInfo nvme_flush_aiocb_info = {
.get_aio_context = nvme_get_aio_context,
};
static void nvme_do_flush(NvmeFlushAIOCB *iocb);
static void nvme_flush_ns_cb(void *opaque, int ret)
{
NvmeFlushAIOCB *iocb = opaque;
@ -3206,13 +3208,11 @@ static void nvme_flush_ns_cb(void *opaque, int ret)
}
out:
iocb->aiocb = NULL;
qemu_bh_schedule(iocb->bh);
nvme_do_flush(iocb);
}
static void nvme_flush_bh(void *opaque)
static void nvme_do_flush(NvmeFlushAIOCB *iocb)
{
NvmeFlushAIOCB *iocb = opaque;
NvmeRequest *req = iocb->req;
NvmeCtrl *n = nvme_ctrl(req);
int i;
@ -3239,14 +3239,8 @@ static void nvme_flush_bh(void *opaque)
return;
done:
qemu_bh_delete(iocb->bh);
iocb->bh = NULL;
iocb->common.cb(iocb->common.opaque, iocb->ret);
qemu_aio_unref(iocb);
return;
}
static uint16_t nvme_flush(NvmeCtrl *n, NvmeRequest *req)
@ -3258,7 +3252,6 @@ static uint16_t nvme_flush(NvmeCtrl *n, NvmeRequest *req)
iocb = qemu_aio_get(&nvme_flush_aiocb_info, NULL, nvme_misc_cb, req);
iocb->req = req;
iocb->bh = qemu_bh_new(nvme_flush_bh, iocb);
iocb->ret = 0;
iocb->ns = NULL;
iocb->nsid = 0;
@ -3280,13 +3273,11 @@ static uint16_t nvme_flush(NvmeCtrl *n, NvmeRequest *req)
}
req->aiocb = &iocb->common;
qemu_bh_schedule(iocb->bh);
nvme_do_flush(iocb);
return NVME_NO_COMPLETE;
out:
qemu_bh_delete(iocb->bh);
iocb->bh = NULL;
qemu_aio_unref(iocb);
return status;