On 15.07.2023 17:25:43, YueHaibing wrote:
> BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80
> Read of size 8 at addr ffff888155846230 by task cat/7862
>
> CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> Call Trace:
> <TASK>
> dump_stack_lvl+0xd5/0x150
> print_report+0xc1/0x5e0
> kasan_report+0xba/0xf0
> bcm_proc_show+0x969/0xa80
> seq_read_iter+0x4f6/0x1260
> seq_read+0x165/0x210
> proc_reg_read+0x227/0x300
> vfs_read+0x1d5/0x8d0
> ksys_read+0x11e/0x240
> do_syscall_64+0x35/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Allocated by task 7846:
> kasan_save_stack+0x1e/0x40
> kasan_set_track+0x21/0x30
> __kasan_kmalloc+0x9e/0xa0
> bcm_sendmsg+0x264b/0x44e0
> sock_sendmsg+0xda/0x180
> ____sys_sendmsg+0x735/0x920
> ___sys_sendmsg+0x11d/0x1b0
> __sys_sendmsg+0xfa/0x1d0
> do_syscall_64+0x35/0xb0
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Freed by task 7846:
> kasan_save_stack+0x1e/0x40
> kasan_set_track+0x21/0x30
> kasan_save_free_info+0x27/0x40
> ____kasan_slab_free+0x161/0x1c0
> slab_free_freelist_hook+0x119/0x220
> __kmem_cache_free+0xb4/0x2e0
> rcu_core+0x809/0x1bd0
>
> bcm_op is freed before procfs entry be removed in bcm_release(),
> this lead to bcm_proc_show() may read the freed bcm_op.
>
> Fixes: ffd980f976e7 ("[CAN]: Add broadcast manager (bcm) protocol")
> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
Added to linux-can/testing.
Thanks,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
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