linux-kernel - [PATCH 5.10 002/152] btrfs: prevent NULL pointer dereference in extent_io_tree

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Message-Id: <20210118113352.883153076@linuxfoundation.org>
Date:   Mon, 18 Jan 2021 12:32:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anand Jain <anand.jain@...cle.com>,
        Su Yue <l@...enly.su>, David Sterba <dsterba@...e.com>
Subject: [PATCH 5.10 002/152] btrfs: prevent NULL pointer dereference in extent_io_tree_panic

From: Su Yue <l@...enly.su>

commit 29b665cc51e8b602bf2a275734349494776e3dbc upstream.

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: 05912a3c04eb ("btrfs: drop extent_io_ops::tree_fs_info callback")
CC: stable@...r.kernel.org # 4.19+
Reviewed-by: Anand Jain <anand.jain@...cle.com>
Signed-off-by: Su Yue <l@...enly.su>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/extent_io.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -676,9 +676,7 @@ alloc_extent_state_atomic(struct extent_
 
 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");
 }