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Shuvam Pandey
1c50c57717
qaic_perf_stats_bo_ioctl() validates each BO by checking bo->sliced and
bo->dbc before returning its perf stats. These fields are changed by the
detach paths while holding bo->lock, but the perf stats ioctl reads them
without that lock.
A concurrent detach can clear bo->dbc and mark the BO unsliced while the
perf stats ioctl is validating the BO. Take bo->lock while checking the
BO state and copying the per-BO stats into the temporary result buffer.
Fixes: 4ddf4ddfce ("accel/qaic: Ensure entry belongs to DBC in qaic_perf_stats_bo_ioctl()")
Signed-off-by: Shuvam Pandey <shuvampandey1@gmail.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Link: https://patch.msgid.link/6a115824.a0bed9bd.3c0137.9edf@mx.google.com