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authorBart Van Assche <bart.vanassche@wdc.com>2018-01-02 11:39:48 -0800
committerJens Axboe <axboe@kernel.dk>2018-01-05 09:03:04 -0700
commit882d4171a8950646413b1a3cbe0e4a6a612fe82e (patch)
tree92dd5094dad515ec3003900354d96f50098df1df /block/blk-core.c
parent5a0ec388ef0f6e33841aeb810d7fa23f049ec4cd (diff)
pktcdvd: Fix a recently introduced NULL pointer dereference
Call bdev_get_queue(bdev) after bdev->bd_disk has been initialized instead of just before that pointer has been initialized. This patch avoids that the following command pktsetup 1 /dev/sr0 triggers the following kernel crash: BUG: unable to handle kernel NULL pointer dereference at 0000000000000548 IP: pkt_setup_dev+0x2db/0x670 [pktcdvd] CPU: 2 PID: 724 Comm: pktsetup Not tainted 4.15.0-rc4-dbg+ #1 Call Trace: pkt_ctl_ioctl+0xce/0x1c0 [pktcdvd] do_vfs_ioctl+0x8e/0x670 SyS_ioctl+0x3c/0x70 entry_SYSCALL_64_fastpath+0x23/0x9a Reported-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Fixes: commit ca18d6f769d2 ("block: Make most scsi_req_init() calls implicit") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Tested-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Cc: Maciej S. Szmigiero <mail@maciej.szmigiero.name> Cc: <stable@vger.kernel.org> # v4.13 Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-core.c')
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