linux-kernel - Re: [PATCH] zram: fix NULL pointer in comp_algorithm

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Message-Id: <173120807169.1615597.15714479143069057914.b4-ty@kernel.dk>
Date: Sat, 09 Nov 2024 20:07:51 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Minchan Kim <minchan@...nel.org>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Liu Shixin <liushixin2@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] zram: fix NULL pointer in comp_algorithm_show()


On Fri, 08 Nov 2024 18:01:47 +0800, Liu Shixin wrote:
> LTP reported a NULL pointer dereference as followed:
> 
>  CPU: 7 UID: 0 PID: 5995 Comm: cat Kdump: loaded Not tainted 6.12.0-rc6+ #3
>  Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
>  pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>  pc : __pi_strcmp+0x24/0x140
>  lr : zcomp_available_show+0x60/0x100 [zram]
>  sp : ffff800088b93b90
>  x29: ffff800088b93b90 x28: 0000000000000001 x27: 0000000000400cc0
>  x26: 0000000000000ffe x25: ffff80007b3e2388 x24: 0000000000000000
>  x23: ffff80007b3e2390 x22: ffff0004041a9000 x21: ffff80007b3e2900
>  x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000
>  x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
>  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
>  x11: 0000000000000000 x10: ffff80007b3e2900 x9 : ffff80007b3cb280
>  x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000
>  x5 : 0000000000000040 x4 : 0000000000000000 x3 : 00656c722d6f7a6c
>  x2 : 0000000000000000 x1 : ffff80007b3e2900 x0 : 0000000000000000
>  Call trace:
>   __pi_strcmp+0x24/0x140
>   comp_algorithm_show+0x40/0x70 [zram]
>   dev_attr_show+0x28/0x80
>   sysfs_kf_seq_show+0x90/0x140
>   kernfs_seq_show+0x34/0x48
>   seq_read_iter+0x1d4/0x4e8
>   kernfs_fop_read_iter+0x40/0x58
>   new_sync_read+0x9c/0x168
>   vfs_read+0x1a8/0x1f8
>   ksys_read+0x74/0x108
>   __arm64_sys_read+0x24/0x38
>   invoke_syscall+0x50/0x120
>   el0_svc_common.constprop.0+0xc8/0xf0
>   do_el0_svc+0x24/0x38
>   el0_svc+0x38/0x138
>   el0t_64_sync_handler+0xc0/0xc8
>   el0t_64_sync+0x188/0x190
> 
> [...]

Applied, thanks!

[1/1] zram: fix NULL pointer in comp_algorithm_show()
      commit: 5fcfcd51ea1c1309a673d45f12698dec53ffbd9b

Best regards,
-- 
Jens Axboe