Description: ext4: fix kernel infoleak via ext4_extent_header
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2060606
 https://syzkaller.appspot.com/bug?id=78e9ad0e6952a3ca16e8234724b2fa92d041b9b8
Notes:
 carnil> it is not clear exactly to which syzkaller report the CVE is assigned to.
 carnil> The https://syzkaller.appspot.com/bug?id=78e9ad0e6952a3ca16e8234724b2fa92d041b9b8
 carnil> is fixed with the mentioned commits, but there is
 carnil> https://syzkaller.appspot.com/bug?id=602bc454598b9bc1186ea9f927f6225ef64a397b
 carnil> which was auto-closed though as invalid.
Bugs:
upstream: released (5.14-rc1) [ce3aba43599f0b50adbebff133df8d08a3d5fffe]
5.10-upstream-stable: released (5.10.50) [ea5466f1a77720217a25a859b5a58b618aaba544]
4.19-upstream-stable: released (4.19.198) [9ed3a3d3a8d2cbe99d9e4386a98856491f0eade0]
4.9-upstream-stable: released (4.9.276) [25dcc64fa0c9399653e1fd1a4bad6c1e8cb31f3f]
sid: released (5.14.6-1)
5.10-bullseye-security: released (5.10.70-1)
4.19-buster-security: released (4.19.208-1)
4.9-stretch-security: released (4.9.290-1)