Re: [PATCH] ext4: fix use-after-free in ext4_orphan_cleanup

Theodore Ts'o
2022-12-06T21:02:24Z

On Wed, 2 Nov 2022 16:06:33 +0800, Baokun Li wrote:
> I caught a issue as follows:
> ==================================================================
> BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0
> Read of size 8 at addr ffff88814b13f378 by task mount/710
>
> CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370
> Call Trace:
> <TASK>
> dump_stack_lvl+0x73/0x9f
> print_report+0x25d/0x759
> kasan_report+0xc0/0x120
> __asan_load8+0x99/0x140
> __list_add_valid+0x28/0x1a0
> ext4_orphan_cleanup+0x564/0x9d0 [ext4]
> __ext4_fill_super+0x48e2/0x5300 [ext4]
> ext4_fill_super+0x19f/0x3a0 [ext4]
> get_tree_bdev+0x27b/0x450
> ext4_get_tree+0x19/0x30 [ext4]
> vfs_get_tree+0x49/0x150
> path_mount+0xaae/0x1350
> do_mount+0xe2/0x110
> __x64_sys_mount+0xf0/0x190
> do_syscall_64+0x35/0x80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> </TASK>
> [...]
> ==================================================================
>
> [...]

Applied, thanks!

[1/1] ext4: fix use-after-free in ext4_orphan_cleanup
commit: ad7ab3c3f740ce379e230d28c6aa8f9550182841

Best regards,
--
Theodore Ts'o <tytso@mit.edu>