tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: a348aa0315d2a90cde93df922b84ab682459a834 commit: 8a6bee347626968d467aef07453c4547bc23cb64 [2815/2815] blk-mq: fix potential uaf for 'queue_hw_ctx' config: x86_64-randconfig-122-20250318 (https://download.01.org/0day-ci/archive/20250318/202503181406.E4pR441t-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250318/202503181406.E4pR441t-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202503181406.E4pR441t-lkp@intel.com/ sparse warnings: (new ones prefixed by >>)

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block/blk-mq-sysfs.c:339:55: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct blk_mq_hw_ctx *hctx @@ got struct blk_mq_hw_ctx [noderef] __rcu * @@ block/blk-mq-sysfs.c:339:55: sparse: expected struct blk_mq_hw_ctx *hctx block/blk-mq-sysfs.c:339:55: sparse: got struct blk_mq_hw_ctx [noderef] __rcu * block/blk-mq-sysfs.c: note: in included file: include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** -- block/blk-mq.c:485:19: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_mq_hw_ctx *hctx @@ got struct blk_mq_hw_ctx [noderef] __rcu * @@ block/blk-mq.c:485:19: sparse: expected struct blk_mq_hw_ctx *hctx block/blk-mq.c:485:19: sparse: got struct blk_mq_hw_ctx [noderef] __rcu * block/blk-mq.c:3270:41: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct blk_mq_hw_ctx **hctxs @@ got struct blk_mq_hw_ctx [noderef] __rcu **queue_hw_ctx @@ block/blk-mq.c:3270:41: sparse: expected struct blk_mq_hw_ctx **hctxs block/blk-mq.c:3270:41: sparse: got struct blk_mq_hw_ctx [noderef] __rcu **queue_hw_ctx block/blk-mq.c:3284:17: sparse: sparse: incompatible types in comparison expression (different address spaces): block/blk-mq.c:3284:17: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * block/blk-mq.c:3284:17: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** block/blk-mq.c:4033:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct blk_mq_hw_ctx *hctx @@ got struct blk_mq_hw_ctx [noderef] __rcu * @@ block/blk-mq.c: note: in included file: include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu ** include/linux/blk-mq.h:620:18: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu *[noderef] __rcu * include/linux/blk-mq.h:620:18: sparse: struct blk_mq_hw_ctx [noderef] __rcu **

vim +485 block/blk-mq.c 320ae51feed5c2 Jens Axboe 2013-10-24 446 cd6ce1482fd9e6 Bart Van Assche 2017-06-20 447 struct request *blk_mq_alloc_request_hctx(struct request_queue *q, 9a95e4ef709533 Bart Van Assche 2017-11-09 448 unsigned int op, blk_mq_req_flags_t flags, unsigned int hctx_idx) 1f5bd336b91505 Ming Lin 2016-06-13 449 { e6e7abffe386b6 Christoph Hellwig 2020-05-29 450 struct blk_mq_alloc_data data = { e6e7abffe386b6 Christoph Hellwig 2020-05-29 451 .q = q, e6e7abffe386b6 Christoph Hellwig 2020-05-29 452 .flags = flags, e6e7abffe386b6 Christoph Hellwig 2020-05-29 453 .cmd_flags = op, e6e7abffe386b6 Christoph Hellwig 2020-05-29 454 }; 600c3b0cea784a Christoph Hellwig 2020-05-29 455 u64 alloc_time_ns = 0; 6d2809d51a5079 Omar Sandoval 2017-02-27 456 unsigned int cpu; 600c3b0cea784a Christoph Hellwig 2020-05-29 457 unsigned int tag; 1f5bd336b91505 Ming Lin 2016-06-13 458 int ret; 1f5bd336b91505 Ming Lin 2016-06-13 459 600c3b0cea784a Christoph Hellwig 2020-05-29 460 /* alloc_time includes depth and tag waits */ 600c3b0cea784a Christoph Hellwig 2020-05-29 461 if (blk_queue_rq_alloc_time(q)) 600c3b0cea784a Christoph Hellwig 2020-05-29 462 alloc_time_ns = ktime_get_ns(); 600c3b0cea784a Christoph Hellwig 2020-05-29 463 1f5bd336b91505 Ming Lin 2016-06-13 464 /* 1f5bd336b91505 Ming Lin 2016-06-13 465 * If the tag allocator sleeps we could get an allocation for a 1f5bd336b91505 Ming Lin 2016-06-13 466 * different hardware context. No need to complicate the low level 1f5bd336b91505 Ming Lin 2016-06-13 467 * allocator for this for the rare use case of a command tied to 1f5bd336b91505 Ming Lin 2016-06-13 468 * a specific queue. 1f5bd336b91505 Ming Lin 2016-06-13 469 */ 600c3b0cea784a Christoph Hellwig 2020-05-29 470 if (WARN_ON_ONCE(!(flags & (BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED)))) 1f5bd336b91505 Ming Lin 2016-06-13 471 return ERR_PTR(-EINVAL); 1f5bd336b91505 Ming Lin 2016-06-13 472 1f5bd336b91505 Ming Lin 2016-06-13 473 if (hctx_idx >= q->nr_hw_queues) 1f5bd336b91505 Ming Lin 2016-06-13 474 return ERR_PTR(-EIO); 1f5bd336b91505 Ming Lin 2016-06-13 475 3a0a529971ec4e Bart Van Assche 2017-11-09 476 ret = blk_queue_enter(q, flags); 1f5bd336b91505 Ming Lin 2016-06-13 477 if (ret) 1f5bd336b91505 Ming Lin 2016-06-13 478 return ERR_PTR(ret); 1f5bd336b91505 Ming Lin 2016-06-13 479 c8712c6a674e33 Christoph Hellwig 2016-09-23 480 /* c8712c6a674e33 Christoph Hellwig 2016-09-23 481 * Check if the hardware context is actually mapped to anything. c8712c6a674e33 Christoph Hellwig 2016-09-23 482 * If not tell the caller that it should skip this queue. c8712c6a674e33 Christoph Hellwig 2016-09-23 483 */ a5ea5811058ddb Christoph Hellwig 2020-05-16 484 ret = -EXDEV; e6e7abffe386b6 Christoph Hellwig 2020-05-29 @485 data.hctx = q->queue_hw_ctx[hctx_idx]; e6e7abffe386b6 Christoph Hellwig 2020-05-29 486 if (!blk_mq_hw_queue_mapped(data.hctx)) a5ea5811058ddb Christoph Hellwig 2020-05-16 487 goto out_queue_exit; e6e7abffe386b6 Christoph Hellwig 2020-05-29 488 cpu = cpumask_first_and(data.hctx->cpumask, cpu_online_mask); e6e7abffe386b6 Christoph Hellwig 2020-05-29 489 data.ctx = __blk_mq_get_ctx(q, cpu); 1f5bd336b91505 Ming Lin 2016-06-13 490 42fdc5e49c2be9 Christoph Hellwig 2020-06-29 491 if (!q->elevator) 600c3b0cea784a Christoph Hellwig 2020-05-29 492 blk_mq_tag_busy(data.hctx); 600c3b0cea784a Christoph Hellwig 2020-05-29 493 a5ea5811058ddb Christoph Hellwig 2020-05-16 494 ret = -EWOULDBLOCK; 600c3b0cea784a Christoph Hellwig 2020-05-29 495 tag = blk_mq_get_tag(&data); 600c3b0cea784a Christoph Hellwig 2020-05-29 496 if (tag == BLK_MQ_NO_TAG) a5ea5811058ddb Christoph Hellwig 2020-05-16 497 goto out_queue_exit; 600c3b0cea784a Christoph Hellwig 2020-05-29 498 return blk_mq_rq_ctx_init(&data, tag, alloc_time_ns); 600c3b0cea784a Christoph Hellwig 2020-05-29 499 a5ea5811058ddb Christoph Hellwig 2020-05-16 500 out_queue_exit: a5ea5811058ddb Christoph Hellwig 2020-05-16 501 blk_queue_exit(q); a5ea5811058ddb Christoph Hellwig 2020-05-16 502 return ERR_PTR(ret); 1f5bd336b91505 Ming Lin 2016-06-13 503 } 1f5bd336b91505 Ming Lin 2016-06-13 504 EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx); 1f5bd336b91505 Ming Lin 2016-06-13 505 :::::: The code at line 485 was first introduced by commit :::::: e6e7abffe386b614a194ec32457a00c304c980f4 blk-mq: simplify the blk_mq_get_request calling convention :::::: TO: Christoph Hellwig <hch@lst.de> :::::: CC: Jens Axboe <axboe@kernel.dk> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki