[kbuild] drivers/nvme/host/rdma.c:1598:13: warning: use of uninitialized value '<unknown>' [CWE-457]

:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: drivers/nvme/host/rdma.c:1598:13: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" :::::: BCC: lkp(a)intel.com CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org TO: Max Gurtovoy <mgurtovoy(a)nvidia.com&gt; CC: Christoph Hellwig <hch(a)lst.de&gt; CC: Israel Rukshin <israelr(a)nvidia.com&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 521a547ced6477c54b4b0cc206000406c221b4d6 commit: 4686af885a9168f9ec70c4063616640911c48b03 nvme-rdma: add helpers for mapping/unmapping request date: 7 months ago :::::: branch date: 28 hours ago :::::: commit date: 7 months ago config: arm-randconfig-c002-20220917 compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 4686af885a9168f9ec70c4063616640911c48b03 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp(a)intel.com&gt; gcc_analyzer warnings: (new ones prefixed by >>) | | ~ | | | | | (14) following 'false' branch... | 'nvme_rdma_dma_map_req': event 15 | |cc1: | (15): ...to here | <------+ | 'nvme_rdma_map_data': events 16-21 | | 1608 | ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (16) returning to 'nvme_rdma_map_data' from 'nvme_rdma_dma_map_req' | 1609 | if (unlikely(ret)) | | ~ | | | | | (17) following 'false' branch... |...... | 1612 | if (req->use_sig_mr) { | | ~~~~~~~~~~~~~~~~ | | | | | | | (18) ...to here | | (19) following 'true' branch... | 1613 | ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (20) ...to here | | (21) calling 'nvme_rdma_map_sg_pi' from 'nvme_rdma_map_data' | +--> 'nvme_rdma_map_sg_pi': events 22-27 | | 1476 | static int nvme_rdma_map_sg_pi(struct nvme_rdma_queue *queue, | | ^~~~~~~~~~~~~~~~~~~ | | | | | (22) entry to 'nvme_rdma_map_sg_pi' |...... | 1489 | if (WARN_ON_ONCE(!req->mr)) | | ~ | | | | | (23) following 'false' branch... |...... | 1492 | nr = ib_map_mr_sg_pi(req->mr, sgl->sg_table.sgl, count, NULL, | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (24) ...to here | 1493 | req->metadata_sgl->sg_table.sgl, pi_count, NULL, | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | 1494 | SZ_4K); | | ~~~~~~ | 1495 | if (unlikely(nr)) | | ~ | | | | | (25) following 'false' branch... |...... | 1498 | nvme_rdma_set_sig_attrs(blk_get_integrity(bio->bi_bdev->bd_disk), c, | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (27) calling 'nvme_rdma_set_sig_attrs' from 'nvme_rdma_map_sg_pi' | 1499 | req->mr->sig_attrs, ns->pi_type); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (26) ...to here | +--> 'nvme_rdma_set_sig_attrs': events 28-31 | | 1437 | static void nvme_rdma_set_sig_attrs(struct blk_integrity *bi, | | ^~~~~~~~~~~~~~~~~~~~~~~ | | | | | (28) entry to 'nvme_rdma_set_sig_attrs' |...... | 1444 | if (control & NVME_RW_PRINFO_PRACT) { | | ~ | | | | | (29) following 'true' branch... |...... | 1447 | nvme_rdma_set_sig_domain(bi, cmd, &sig_attrs->wire, control, | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (30) ...to here | | (31) calling 'nvme_rdma_set_sig_domain' from 'nvme_rdma_set_sig_attrs' | 1448 | pi_type); | | ~~~~~~~~ | +--> 'nvme_rdma_set_sig_domain': events 32-33 | | 1419 | static void nvme_rdma_set_sig_domain(struct blk_integrity *bi, | | ^~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (32) entry to 'nvme_rdma_set_sig_domain' |...... | 1425 | domain->sig.dif.pi_interval = 1 << bi->interval_exp; | | ~~~~~~~~~~~~~~~~ | | | | | (33) dereference of NULL 'bi' | drivers/nvme/host/rdma.c: In function 'nvme_rdma_map_data': 1598 | int count, ret; | ^~~~~ 'nvme_rdma_queue_rq': events 1-4 | | 2056 | static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, | | ^~~~~~~~~~~~~~~~~~ | | | | | (1) entry to 'nvme_rdma_queue_rq' |...... | 2072 | if (!nvme_check_ready(&queue->ctrl->ctrl, rq, queue_ready)) | | ~ | | | | | (2) following 'true' branch... |...... | 2075 | dev = queue->device->dev; | | ~~~~~~~~~~~~~ | | | | | (3) ...to here |...... | 2081 | if (unlikely(err)) | | ~ | | | | | (4) following 'false' branch... | 'nvme_rdma_queue_rq': event 5 | |include/rdma/ib_verbs.h:4192:17: | 4192 | dma_sync_single_for_cpu(dev->dma_device, addr, size, dir); | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (5) ...to here | 'nvme_rdma_queue_rq': events 6-8 | |drivers/nvme/host/rdma.c:2088:12: | 2088 | if (ret) | | ^ | | | | | (6) following 'false' branch (when 'ret == 0')... |...... | 2091 | blk_mq_start_request(rq); | | ~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (7) ...to here |...... | 2102 | err = nvme_rdma_map_data(queue, rq, c); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (8) calling 'nvme_rdma_map_data' from 'nvme_rdma_queue_rq' | +--> 'nvme_rdma_map_data': events 9-10 | | 1591 | static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, | | ^~~~~~~~~~~~~~~~~~ | | | | | (9) entry to 'nvme_rdma_map_data' |...... | 1598 | int count, ret; | | ~~~~~ | | | | | (10) use of uninitialized value '<unknown>' here | vim +1598 drivers/nvme/host/rdma.c 4686af885a9168 Max Gurtovoy 2022-02-09 1590 4686af885a9168 Max Gurtovoy 2022-02-09 1591 static int nvme_rdma_map_data(struct nvme_rdma_queue *queue, 4686af885a9168 Max Gurtovoy 2022-02-09 1592 struct request *rq, struct nvme_command *c) 4686af885a9168 Max Gurtovoy 2022-02-09 1593 { 4686af885a9168 Max Gurtovoy 2022-02-09 1594 struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); 4686af885a9168 Max Gurtovoy 2022-02-09 1595 struct nvme_rdma_device *dev = queue->device; 4686af885a9168 Max Gurtovoy 2022-02-09 1596 struct ib_device *ibdev = dev->dev; 4686af885a9168 Max Gurtovoy 2022-02-09 1597 int pi_count = 0; 4686af885a9168 Max Gurtovoy 2022-02-09 @1598 int count, ret; 4686af885a9168 Max Gurtovoy 2022-02-09 1599 4686af885a9168 Max Gurtovoy 2022-02-09 1600 req->num_sge = 1; 4686af885a9168 Max Gurtovoy 2022-02-09 1601 refcount_set(&req->ref, 2); /* send and recv completions */ 4686af885a9168 Max Gurtovoy 2022-02-09 1602 4686af885a9168 Max Gurtovoy 2022-02-09 1603 c->common.flags |= NVME_CMD_SGL_METABUF; 4686af885a9168 Max Gurtovoy 2022-02-09 1604 4686af885a9168 Max Gurtovoy 2022-02-09 1605 if (!blk_rq_nr_phys_segments(rq)) 4686af885a9168 Max Gurtovoy 2022-02-09 1606 return nvme_rdma_set_sg_null(c); 4686af885a9168 Max Gurtovoy 2022-02-09 1607 4686af885a9168 Max Gurtovoy 2022-02-09 1608 ret = nvme_rdma_dma_map_req(ibdev, rq, &count, &pi_count); 4686af885a9168 Max Gurtovoy 2022-02-09 1609 if (unlikely(ret)) 4686af885a9168 Max Gurtovoy 2022-02-09 1610 return ret; 4686af885a9168 Max Gurtovoy 2022-02-09 1611 5ec5d3bddc6b91 Max Gurtovoy 2020-05-19 1612 if (req->use_sig_mr) { 5ec5d3bddc6b91 Max Gurtovoy 2020-05-19 1613 ret = nvme_rdma_map_sg_pi(queue, req, c, count, pi_count); 5ec5d3bddc6b91 Max Gurtovoy 2020-05-19 1614 goto out; 5ec5d3bddc6b91 Max Gurtovoy 2020-05-19 1615 } 5ec5d3bddc6b91 Max Gurtovoy 2020-05-19 1616 64a741c1eaa83e Steve Wise 2018-06-20 1617 if (count <= dev->num_inline_segments) { b131c61d62266e Christoph Hellwig 2017-01-13 1618 if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) && 64a741c1eaa83e Steve Wise 2018-06-20 1619 queue->ctrl->use_inline_data && b131c61d62266e Christoph Hellwig 2017-01-13 1620 blk_rq_payload_bytes(rq) <= 94423a8f89ed7b Max Gurtovoy 2018-06-10 1621 nvme_rdma_inline_data_size(queue)) { 64a741c1eaa83e Steve Wise 2018-06-20 1622 ret = nvme_rdma_map_sg_inline(queue, req, c, count); 94423a8f89ed7b Max Gurtovoy 2018-06-10 1623 goto out; 94423a8f89ed7b Max Gurtovoy 2018-06-10 1624 } 71102307196028 Christoph Hellwig 2016-07-06 1625 64a741c1eaa83e Steve Wise 2018-06-20 1626 if (count == 1 && dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) { 94423a8f89ed7b Max Gurtovoy 2018-06-10 1627 ret = nvme_rdma_map_sg_single(queue, req, c); 94423a8f89ed7b Max Gurtovoy 2018-06-10 1628 goto out; 71102307196028 Christoph Hellwig 2016-07-06 1629 } 94423a8f89ed7b Max Gurtovoy 2018-06-10 1630 } 94423a8f89ed7b Max Gurtovoy 2018-06-10 1631 94423a8f89ed7b Max Gurtovoy 2018-06-10 1632 ret = nvme_rdma_map_sg_fr(queue, req, c, count); 94423a8f89ed7b Max Gurtovoy 2018-06-10 1633 out: 94423a8f89ed7b Max Gurtovoy 2018-06-10 1634 if (unlikely(ret)) 4686af885a9168 Max Gurtovoy 2022-02-09 1635 goto out_dma_unmap_req; 71102307196028 Christoph Hellwig 2016-07-06 1636 94423a8f89ed7b Max Gurtovoy 2018-06-10 1637 return 0; 94423a8f89ed7b Max Gurtovoy 2018-06-10 1638 4686af885a9168 Max Gurtovoy 2022-02-09 1639 out_dma_unmap_req: 4686af885a9168 Max Gurtovoy 2022-02-09 1640 nvme_rdma_dma_unmap_req(ibdev, rq); 94423a8f89ed7b Max Gurtovoy 2018-06-10 1641 return ret; 71102307196028 Christoph Hellwig 2016-07-06 1642 } 71102307196028 Christoph Hellwig 2016-07-06 1643 -- 0-DAY CI Kernel Test Service https://01.org/lkp