null_blk: return error for invalid zone size
[ Upstream commit e274832590
]
In null_init_zone_dev() check if the zone size is larger than device
capacity, return error if needed.
This also fixes the following oops :-
null_blk: changed the number of conventional zones to 4294967295
BUG: kernel NULL pointer dereference, address: 0000000000000010
PGD 7d76c5067 P4D 7d76c5067 PUD 7d240c067 PMD 0
Oops: 0002 [#1] SMP NOPTI
CPU: 4 PID: 5508 Comm: nullbtests.sh Tainted: G OE 5.7.0-rc4lblk-fnext0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e4
RIP: 0010:null_init_zoned_dev+0x17a/0x27f [null_blk]
RSP: 0018:ffffc90007007e00 EFLAGS: 00010246
RAX: 0000000000000020 RBX: ffff8887fb3f3c00 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffff8887ca09d688 RDI: ffff888810fea510
RBP: 0000000000000010 R08: ffff8887ca09d688 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8887c26e8000
R13: ffffffffa05e9390 R14: 0000000000000000 R15: 0000000000000001
FS: 00007fcb5256f740(0000) GS:ffff888810e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 000000081e8fe000 CR4: 00000000003406e0
Call Trace:
null_add_dev+0x534/0x71b [null_blk]
nullb_device_power_store.cold.41+0x8/0x2e [null_blk]
configfs_write_file+0xe6/0x150
vfs_write+0xba/0x1e0
ksys_write+0x5f/0xe0
do_syscall_64+0x60/0x250
entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7fcb51c71840
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
b5cb7fe920
commit
6a904892d8
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@ -20,6 +20,10 @@ int null_zone_init(struct nullb_device *dev)
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pr_err("zone_size must be power-of-two\n");
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return -EINVAL;
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}
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if (dev->zone_size > dev->size) {
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pr_err("Zone size larger than device capacity\n");
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return -EINVAL;
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}
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dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
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dev->nr_zones = dev_size >>
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