• Anand Jain's avatar
    btrfs: fix null pointer dereference in clone_fs_devices when name is null · e755f780
    Anand Jain authored
    when one of the device path is missing btrfs_device name is null. So this
    patch will check for that.
    
    stack:
    BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
    IP: [<ffffffff812e18c0>] strlen+0x0/0x30
    [<ffffffffa01cd92a>] ? clone_fs_devices+0xaa/0x160 [btrfs]
    [<ffffffffa01cdcf7>] btrfs_init_new_device+0x317/0xca0 [btrfs]
    [<ffffffff81155bca>] ? __kmalloc_track_caller+0x15a/0x1a0
    [<ffffffffa01d6473>] btrfs_ioctl+0xaa3/0x2860 [btrfs]
    [<ffffffff81132a6c>] ? handle_mm_fault+0x48c/0x9c0
    [<ffffffff81192a61>] ? __blkdev_put+0x171/0x180
    [<ffffffff817a784c>] ? __do_page_fault+0x4ac/0x590
    [<ffffffff81193426>] ? blkdev_put+0x106/0x110
    [<ffffffff81179175>] ? mntput+0x35/0x40
    [<ffffffff8116d4b0>] do_vfs_ioctl+0x460/0x4a0
    [<ffffffff8115c72e>] ? ____fput+0xe/0x10
    [<ffffffff81068033>] ? task_work_run+0xb3/0xd0
    [<ffffffff8116d547>] SyS_ioctl+0x57/0x90
    [<ffffffff817a793e>] ? do_page_fault+0xe/0x10
    [<ffffffff817abe52>] system_call_fastpath+0x16/0x1b
    
    reproducer:
    mkfs.btrfs -draid1 -mraid1 /dev/sdg1 /dev/sdg2
    btrfstune -S 1 /dev/sdg1
    modprobe -r btrfs && modprobe btrfs
    mount -o degraded /dev/sdg1 /btrfs
    btrfs dev add /dev/sdg3 /btrfs
    Signed-off-by: default avatarAnand Jain <Anand.Jain@oracle.com>
    Signed-off-by: default avatarChris Mason <clm@fb.com>
    e755f780
volumes.c 164 KB