linux-kernel - Re: [PATCH v1 1/1] ufs: core: fix shift issue in ufshcd_clear

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Message-ID: <CAGaU9a8EQDdrrgzuaqBYk6h-r4u6spozH3cHeHO-98dNjEv-AA@mail.gmail.com>
Date: Mon, 5 Feb 2024 22:43:53 +0800
From: Stanley Jhu <chu.stanley@...il.com>
To: alice.chao@...iatek.com
Cc: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>, 
	Bart Van Assche <bvanassche@....org>, "James E.J. Bottomley" <jejb@...ux.ibm.com>, 
	"Martin K. Petersen" <martin.petersen@...cle.com>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, wsd_upstream@...iatek.com, 
	stanley.chu@...iatek.com, peter.wang@...iatek.com, powen.kao@...iatek.com, 
	naomi.chu@...iatek.com, cc.chou@...iatek.com, tun-yu.yu@...iatek.com, 
	chun-hung.wu@...iatek.com, casper.li@...iatek.com, linux-scsi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v1 1/1] ufs: core: fix shift issue in ufshcd_clear_cmd

On Mon, Feb 5, 2024 at 7:27 PM <alice.chao@...iatek.com> wrote:
>
> From: Alice Chao <alice.chao@...iatek.com>
>
> When task_tag > 32 (in mcq mode), 1U << task_tag will out of bound
> for u32 mask. Fix this bug to prevent SHIFT_ISSUE (Bitwise shifts
> that are out of bounds for their data type).
>
> [name:debug_monitors&]Unexpected kernel BRK exception at EL1
> [name:traps&]Internal error: BRK handler: 00000000f2005514 [#1] PREEMPT SMP
> [name:mediatek_cpufreq_hw&]cpufreq stop DVFS log done
> [name:mrdump&]Kernel Offset: 0x1ba5800000 from 0xffffffc008000000
> [name:mrdump&]PHYS_OFFSET: 0x80000000
> [name:mrdump&]pstate: 22400005 (nzCv daif +PAN -UAO)
> [name:mrdump&]pc : [0xffffffdbaf52bb2c] ufshcd_clear_cmd+0x280/0x288
> [name:mrdump&]lr : [0xffffffdbaf52a774] ufshcd_wait_for_dev_cmd+0x3e4/0x82c
> [name:mrdump&]sp : ffffffc0081471b0
> <snip>
> Workqueue: ufs_eh_wq_0 ufshcd_err_handler
> Call trace:
>  dump_backtrace+0xf8/0x144
>  show_stack+0x18/0x24
>  dump_stack_lvl+0x78/0x9c
>  dump_stack+0x18/0x44
>  mrdump_common_die+0x254/0x480 [mrdump]
>  ipanic_die+0x20/0x30 [mrdump]
>  notify_die+0x15c/0x204
>  die+0x10c/0x5f8
>  arm64_notify_die+0x74/0x13c
>  do_debug_exception+0x164/0x26c
>  el1_dbg+0x64/0x80
>  el1h_64_sync_handler+0x3c/0x90
>  el1h_64_sync+0x68/0x6c
>  ufshcd_clear_cmd+0x280/0x288
>  ufshcd_wait_for_dev_cmd+0x3e4/0x82c
>  ufshcd_exec_dev_cmd+0x5bc/0x9ac
>  ufshcd_verify_dev_init+0x84/0x1c8
>  ufshcd_probe_hba+0x724/0x1ce0
>  ufshcd_host_reset_and_restore+0x260/0x574
>  ufshcd_reset_and_restore+0x138/0xbd0
>  ufshcd_err_handler+0x1218/0x2f28
>  process_one_work+0x5fc/0x1140
>  worker_thread+0x7d8/0xe20
>  kthread+0x25c/0x468
>  ret_from_fork+0x10/0x20
>
> Signed-off-by: Alice Chao <alice.chao@...iatek.com>

Reviewed-by: Stanley Jhu <chu.stanley@...il.com>