Patch "scsi: sd_zbc: Fix potential memory leak" has been added to the 4.15-stable tree

Patch "scsi: sd_zbc: Fix potential memory leak" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    scsi: sd_zbc: Fix potential memory leak

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     scsi-sd_zbc-fix-potential-memory-leak.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4b433924b2755a94f99258c178684a0e05c344de Mon Sep 17 00:00:00 2001
From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Fri, 2 Mar 2018 07:19:28 +0900
Subject: scsi: sd_zbc: Fix potential memory leak

From: Damien Le Moal <damien.lemoal@wdc.com>

commit 4b433924b2755a94f99258c178684a0e05c344de upstream.

Rework sd_zbc_check_zone_size() to avoid a memory leak due to an early
return if sd_zbc_report_zones() fails.

Reported-by: David.butterfield <david.butterfield@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Cc: stable@vger.kernel.org
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/sd_zbc.c |   35 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 20 deletions(-)

--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -486,7 +486,7 @@ static int sd_zbc_check_capacity(struct
  */
 static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
 {
-	u64 zone_blocks;
+	u64 zone_blocks = 0;
 	sector_t block = 0;
 	unsigned char *buf;
 	unsigned char *rec;
@@ -504,10 +504,8 @@ static int sd_zbc_check_zone_size(struct
 
 	/* Do a report zone to get the same field */
 	ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0);
-	if (ret) {
-		zone_blocks = 0;
-		goto out;
-	}
+	if (ret)
+		goto out_free;
 
 	same = buf[4] & 0x0f;
 	if (same > 0) {
@@ -547,7 +545,7 @@ static int sd_zbc_check_zone_size(struct
 			ret = sd_zbc_report_zones(sdkp, buf,
 						  SD_ZBC_BUF_SIZE, block);
 			if (ret)
-				return ret;
+				goto out_free;
 		}
 
 	} while (block < sdkp->capacity);
@@ -555,35 +553,32 @@ static int sd_zbc_check_zone_size(struct
 	zone_blocks = sdkp->zone_blocks;
 
 out:
-	kfree(buf);
-
 	if (!zone_blocks) {
 		if (sdkp->first_scan)
 			sd_printk(KERN_NOTICE, sdkp,
 				  "Devices with non constant zone "
 				  "size are not supported\n");
-		return -ENODEV;
-	}
-
-	if (!is_power_of_2(zone_blocks)) {
+		ret = -ENODEV;
+	} else if (!is_power_of_2(zone_blocks)) {
 		if (sdkp->first_scan)
 			sd_printk(KERN_NOTICE, sdkp,
 				  "Devices with non power of 2 zone "
 				  "size are not supported\n");
-		return -ENODEV;
-	}
-
-	if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
+		ret = -ENODEV;
+	} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
 		if (sdkp->first_scan)
 			sd_printk(KERN_NOTICE, sdkp,
 				  "Zone size too large\n");
-		return -ENODEV;
+		ret = -ENODEV;
+	} else {
+		sdkp->zone_blocks = zone_blocks;
+		sdkp->zone_shift = ilog2(zone_blocks);
 	}
 
-	sdkp->zone_blocks = zone_blocks;
-	sdkp->zone_shift = ilog2(zone_blocks);
+out_free:
+	kfree(buf);
 
-	return 0;
+	return ret;
 }
 
 static int sd_zbc_setup(struct scsi_disk *sdkp)


Patches currently in stable-queue which might be from damien.lemoal@wdc.com are

queue-4.15/scsi-sd_zbc-fix-potential-memory-leak.patch