From: Fan Ni fan.ni@samsung.com
commit f04facfb993de47e2133b2b842d72b97b1c50162 upstream.
Due to a typo, the check of whether or not a memdev has already been used as a target for the region (above code piece) will always be skipped. Given a memdev with more than one HDM decoder, an interleaved region can be created that maps multiple HPAs to the same DPA. According to CXL spec 3.0 8.1.3.8.4, "Aliasing (mapping more than one Host Physical Address (HPA) to a single Device Physical Address) is forbidden."
Fix this by using existing iterator for memdev reuse check.
Cc: stable@vger.kernel.org Fixes: 384e624bb211 ("cxl/region: Attach endpoint decoders") Signed-off-by: Fan Ni fan.ni@samsung.com Link: https://lore.kernel.org/r/20221107212153.745993-1-fan.ni@samsung.com Signed-off-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cxl/core/region.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1226,7 +1226,7 @@ static int cxl_region_attach(struct cxl_ struct cxl_endpoint_decoder *cxled_target; struct cxl_memdev *cxlmd_target;
- cxled_target = p->targets[pos]; + cxled_target = p->targets[i]; if (!cxled_target) continue;