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

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Date: Thu, 13 Jun 2024 16:02:02 -0400
From: Joel Slebodnick <jslebodn@...hat.com>
To: linux-scsi@...r.kernel.org
Cc: 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,
	ahalaney@...hat.com,
	beanhuo@...ron.com,
	Joel Slebodnick <jslebodn@...hat.com>,
	stable@...r.kernel.org
Subject: [PATCH] scsi: ufs: core: Free memory allocated for model before reinit

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

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

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
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