linux-kernel - Re: [PATCH] scsi: ufs: core: Free memory allocated for model before reinit

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Date: Thu, 13 Jun 2024 14:34:12 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: Joel Slebodnick <jslebodn@...hat.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org, 
	James.Bottomley@...senpartnership.com, martin.petersen@...cle.com, peter.wang@...iatek.com, 
	manivannan.sadhasivam@...aro.org, beanhuo@...ron.com
Subject: Re: [PATCH] scsi: ufs: core: Free memory allocated for model before
 reinit

On Thu, Jun 13, 2024 at 02:27:28PM GMT, Joel Slebodnick wrote:
> Under the conditions that a device is to be reinitialized within
> ufshcd_probe_hba, the device must first be fully reset.
> 
> Resetting the device should include freeing U8 model (member of
> dev_info)  but does not, and this causes a memory leak.
> ufs_put_device_desc is responsible for freeing model.
> 
> unreferenced object 0xffff3f63008bee60 (size 32):
>   comm "kworker/u33:1", pid 60, jiffies 4294892642
>   hex dump (first 32 bytes):
>     54 48 47 4a 46 47 54 30 54 32 35 42 41 5a 5a 41  THGJFGT0T25BAZZA
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace (crc ed7ff1a9):
>     [<ffffb86705f1243c>] kmemleak_alloc+0x34/0x40
>     [<ffffb8670511cee4>] __kmalloc_noprof+0x1e4/0x2fc
>     [<ffffb86705c247fc>] ufshcd_read_string_desc+0x94/0x190
>     [<ffffb86705c26854>] ufshcd_device_init+0x480/0xdf8
>     [<ffffb86705c27b68>] ufshcd_probe_hba+0x3c/0x404
>     [<ffffb86705c29264>] ufshcd_async_scan+0x40/0x370
>     [<ffffb86704f43e9c>] async_run_entry_fn+0x34/0xe0
>     [<ffffb86704f34638>] process_one_work+0x154/0x298
>     [<ffffb86704f34a74>] worker_thread+0x2f8/0x408
>     [<ffffb86704f3cfa4>] kthread+0x114/0x118
>     [<ffffb86704e955a0>] ret_from_fork+0x10/0x20
> 

With the following in place:

    Fixes: 96a7141da332 ("scsi: ufs: core: Add support for reinitializing the UFS device")
    Cc: stable@...r.kernel.org

feel free to add:

    Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

> Signed-off-by: Joel Slebodnick <jslebodn@...hat.com>
> ---
>  drivers/ufs/core/ufshcd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 0cf07194bbe8..a0407b9213ca 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8787,6 +8787,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params)
>  	    (hba->quirks & UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH)) {
>  		/* Reset the device and controller before doing reinit */
>  		ufshcd_device_reset(hba);
> +		ufs_put_device_desc(hba);
>  		ufshcd_hba_stop(hba);
>  		ufshcd_vops_reinit_notify(hba);
>  		ret = ufshcd_hba_enable(hba);
> -- 
> 2.40.1
>