Chaitanya Kulkarni 59c157433f nvme-core: check bdev value for NULL ... The nvme-core sets the bdev to NULL when admin comamnd is issued from IOCTL in the following path e.g. nvme list :- block_ioctl() blkdev_ioctl() nvme_ioctl() nvme_user_cmd() nvme_submit_user_cmd() The commit 309dca309f ("block: store a block_device pointer in struct bio") now uses bdev unconditionally in the macro bio_set_dev() and assumes that bdev value is not NULL which results in the following crash in since thats where bdev is actually accessed :- void bio_associate_blkg_from_css(struct bio *bio, struct cgroup_subsys_state *css) { if (bio->bi_blkg) blkg_put(bio->bi_blkg); if (css && css->parent) { bio->bi_blkg = blkg_tryget_closest(bio, css); } else { --------------> blkg_get(bio->bi_bdev->bd_disk->queue->root_blkg); bio->bi_blkg = bio->bi_bdev->bd_disk->queue->root_blkg; } } EXPORT_SYMBOL_GPL(bio_associate_blkg_from_css); [ 345.385947] BUG: kernel NULL pointer dereference, address: 0000000000000690 [ 345.387103] #PF: supervisor read access in kernel mode [ 345.387894] #PF: error_code(0x0000) - not-present page [ 345.388756] PGD 162a2b067 P4D 162a2b067 PUD 1633eb067 PMD 0 [ 345.389625] Oops: 0000 [#1] SMP NOPTI [ 345.390206] CPU: 15 PID: 4100 Comm: nvme Tainted: G OE 5.11.0-rc5blk+ #141 [ 345.391377] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba52764 [ 345.393074] RIP: 0010:bio_associate_blkg_from_css.cold.47+0x58/0x21f [ 345.396362] RSP: 0018:ffffc90000dbbce8 EFLAGS: 00010246 [ 345.397078] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000027 [ 345.398114] RDX: 0000000000000000 RSI: ffff888813be91f0 RDI: ffff888813be91f8 [ 345.399039] RBP: ffffc90000dbbd30 R08: 0000000000000001 R09: 0000000000000001 [ 345.399950] R10: 0000000064c66670 R11: 00000000ef955201 R12: ffff888812d32800 [ 345.401031] R13: 0000000000000000 R14: ffff888113e51540 R15: ffff888113e51540 [ 345.401976] FS: 00007f3747f1d780(0000) GS:ffff888813a00000(0000) knlGS:0000000000000000 [ 345.402997] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 345.403737] CR2: 0000000000000690 CR3: 000000081a4bc000 CR4: 00000000003506e0 [ 345.404685] Call Trace: [ 345.405031] bio_associate_blkg+0x71/0x1c0 [ 345.405649] nvme_submit_user_cmd+0x1aa/0x38e [nvme_core] [ 345.406348] nvme_user_cmd.isra.73.cold.98+0x54/0x92 [nvme_core] [ 345.407117] nvme_ioctl+0x226/0x260 [nvme_core] [ 345.407707] blkdev_ioctl+0x1c8/0x2b0 [ 345.408183] block_ioctl+0x3f/0x50 [ 345.408627] __x64_sys_ioctl+0x84/0xc0 [ 345.409117] do_syscall_64+0x33/0x40 [ 345.409592] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 345.410233] RIP: 0033:0x7f3747632107 [ 345.413125] RSP: 002b:00007ffe461b6648 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 [ 345.414086] RAX: ffffffffffffffda RBX: 00000000007b7fd0 RCX: 00007f3747632107 [ 345.414998] RDX: 00007ffe461b6650 RSI: 00000000c0484e41 RDI: 0000000000000004 [ 345.415966] RBP: 0000000000000004 R08: 00000000007b7fe8 R09: 00000000007b9080 [ 345.416883] R10: 00007ffe461b62c0 R11: 0000000000000206 R12: 00000000007b7fd0 [ 345.417808] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000 Add a NULL check before we set the bdev for bio. This issue is found on block/for-next tree. Fixes: 309dca309f ("block: store a block_device pointer in struct bio") Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-01-27 10:10:15 -07:00
..
host	nvme-core: check bdev value for NULL	2021-01-27 10:10:15 -07:00
target	block: use an on-stack bio in blkdev_issue_flush	2021-01-27 09:51:48 -07:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00