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btrfs: prevent NULL pointer dereference in extent_io_tree_panic 

Some extent io trees are initialized with NULL private member (e.g.
btrfs_device::alloc_state and btrfs_fs_info::excluded_extents).
Dereference of a NULL tree->private as inode pointer will cause panic.

Pass tree->fs_info as it's known to be valid in all cases.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208929
Fixes: 05912a3c04 ("btrfs: drop extent_io_ops::tree_fs_info callback")
CC: stable@vger.kernel.org # 4.19+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Su Yue <l@damenly.su>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2021-01-03 17:28:03 +08:00 committed by David Sterba
parent 71008734d2
commit 29b665cc51
1 changed files with 1 additions and 3 deletions
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4
fs/btrfs/extent_io.c
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@ -676,9 +676,7 @@ alloc_extent_state_atomic(struct extent_state *prealloc)
static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
{
struct inode *inode = tree->private_data;
btrfs_panic(btrfs_sb(inode->i_sb), err,
btrfs_panic(tree->fs_info, err,
"locking error: extent tree was modified by another thread while locked");
}