On Tue, Feb 20, 2018 at 10:48:09PM +0800, Anand Jain wrote: > Replace target can be missing after a reboot during the replace. > So check if device is null. > > BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0 > IP: btrfs_destroy_dev_replace_tgtdev+0x43/0xf0 [btrfs] > Call Trace: > btrfs_dev_replace_cancel+0x22b/0x250 [btrfs] > btrfs_ioctl+0x2216/0x2590 [btrfs] > ? do_vfs_ioctl+0x625/0x650 > do_vfs_ioctl+0x625/0x650 > ? security_file_ioctl+0x30/0x50 > SyS_ioctl+0x4e/0x80 > do_syscall_64+0x5d/0x160 > entry_SYSCALL64_slow_path+0x25/0x25 > > Signed-off-by: Anand Jain <anand.j...@oracle.com> > --- > fs/btrfs/dev-replace.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c > index 87f975143c05..476981c2cf55 100644 > --- a/fs/btrfs/dev-replace.c > +++ b/fs/btrfs/dev-replace.c > @@ -749,7 +749,8 @@ int btrfs_dev_replace_cancel(struct btrfs_fs_info > *fs_info) > btrfs_dev_name(src_device), src_device->devid, > btrfs_dev_name(tgt_device)); > > - btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); > + if (tgt_device) > + btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
I'll just discard the patch you sent a week ago that removes the 'if' in the first place. https://patchwork.kernel.org/patch/10215103/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
