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crypto: qat - Fix ADF_DEV_RESET_SYNC memory leak

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commit d3b17c6d9d upstream.

Using completion_done to determine whether the caller has gone
away only works after a complete call.  Furthermore it's still
possible that the caller has not yet called wait_for_completion,
resulting in another potential UAF.

Fix this by making the caller use cancel_work_sync and then freeing
the memory safely.

Fixes: 7d42e09760 ("crypto: qat - resolve race condition during AER recovery")
Cc: <stable@vger.kernel.org> #6.8+
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herbert Xu 2024-05-08 16:39:51 +08:00 committed by Greg Kroah-Hartman
parent d14104360c
commit c2d443aa1a
1 changed files with 5 additions and 14 deletions
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19
drivers/crypto/intel/qat/qat_common/adf_aer.c
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@ -92,8 +92,7 @@ static void adf_device_reset_worker(struct work_struct *work)
if (adf_dev_restart(accel_dev)) {
/* The device hanged and we can't restart it so stop here */
dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
if (reset_data->mode == ADF_DEV_RESET_ASYNC ||
completion_done(&reset_data->compl))
if (reset_data->mode == ADF_DEV_RESET_ASYNC)
kfree(reset_data);
WARN(1, "QAT: device restart failed. Device is unusable\n");
return;
@ -101,16 +100,8 @@ static void adf_device_reset_worker(struct work_struct *work)
adf_dev_restarted_notify(accel_dev);
clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
/*
* The dev is back alive. Notify the caller if in sync mode
*
* If device restart will take a more time than expected,
* the schedule_reset() function can timeout and exit. This can be
* detected by calling the completion_done() function. In this case
* the reset_data structure needs to be freed here.
*/
if (reset_data->mode == ADF_DEV_RESET_ASYNC ||
completion_done(&reset_data->compl))
/* The dev is back alive. Notify the caller if in sync mode */
if (reset_data->mode == ADF_DEV_RESET_ASYNC)
kfree(reset_data);
else
complete(&reset_data->compl);
@ -145,10 +136,10 @@ static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
if (!timeout) {
dev_err(&GET_DEV(accel_dev),
"Reset device timeout expired\n");
cancel_work_sync(&reset_data->reset_work);
ret = -EFAULT;
} else {
kfree(reset_data);
}
kfree(reset_data);
return ret;
}
return 0;