From: Jacob Moroni Date: Tue, 24 Feb 2026 23:41:53 +0000 (+0000) Subject: RDMA/umem: Fix double dma_buf_unpin in failure path X-Git-Tag: ceph-for-7.0-rc4~96^2~1 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=104016eb671e19709721c1b0048dd912dc2e96be;p=ceph-client.git RDMA/umem: Fix double dma_buf_unpin in failure path In ib_umem_dmabuf_get_pinned_with_dma_device(), the call to ib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf is immediately unpinned but the umem_dmabuf->pinned flag is still set. Then, when ib_umem_release() is called, it calls ib_umem_dmabuf_revoke() which will call dma_buf_unpin() again. Fix this by removing the immediate unpin upon failure and just let the ib_umem_release/revoke path handle it. This also ensures the proper unmap-unpin unwind ordering if the dmabuf_map_pages call happened to fail due to dma_resv_wait_timeout (and therefore has a non-NULL umem_dmabuf->sgt). Fixes: 1e4df4a21c5a ("RDMA/umem: Allow pinned dmabuf umem usage") Signed-off-by: Jacob Moroni Link: https://patch.msgid.link/20260224234153.1207849-1-jmoroni@google.com Signed-off-by: Leon Romanovsky --- diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c index f5298c33e581..d30f24b90bca 100644 --- a/drivers/infiniband/core/umem_dmabuf.c +++ b/drivers/infiniband/core/umem_dmabuf.c @@ -218,13 +218,11 @@ ib_umem_dmabuf_get_pinned_with_dma_device(struct ib_device *device, err = ib_umem_dmabuf_map_pages(umem_dmabuf); if (err) - goto err_unpin; + goto err_release; dma_resv_unlock(umem_dmabuf->attach->dmabuf->resv); return umem_dmabuf; -err_unpin: - dma_buf_unpin(umem_dmabuf->attach); err_release: dma_resv_unlock(umem_dmabuf->attach->dmabuf->resv); ib_umem_release(&umem_dmabuf->umem);