linux-kernel - [PATCH 4.4 183/312] target: Fix a memory leak in target_dev_lba_map

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Message-Id: <20200508123137.353779595@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:32:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Andy Grover <agrover@...hat.com>,
        Sagi Grimberg <sagig@...lanox.com>,
        Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 4.4 183/312] target: Fix a memory leak in target_dev_lba_map_store()

From: Bart Van Assche <bart.vanassche@...disk.com>

commit f0a8afecb29ad0005e7e946228a0ef5422058b85 upstream.

strsep() modifies its first argument. Make the pointer passed to kfree()
match the return value of kmalloc().

Fixes: 229d4f112fd6 (commit "target_core_alua: Referrals configfs integration")
Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Andy Grover <agrover@...hat.com>
Cc: Sagi Grimberg <sagig@...lanox.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/target_core_configfs.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1980,14 +1980,14 @@ static ssize_t target_dev_lba_map_store(
 	struct se_device *dev = to_device(item);
 	struct t10_alua_lba_map *lba_map = NULL;
 	struct list_head lba_list;
-	char *map_entries, *ptr;
+	char *map_entries, *orig, *ptr;
 	char state;
 	int pg_num = -1, pg;
 	int ret = 0, num = 0, pg_id, alua_state;
 	unsigned long start_lba = -1, end_lba = -1;
 	unsigned long segment_size = -1, segment_mult = -1;
 
-	map_entries = kstrdup(page, GFP_KERNEL);
+	orig = map_entries = kstrdup(page, GFP_KERNEL);
 	if (!map_entries)
 		return -ENOMEM;
 
@@ -2085,7 +2085,7 @@ out:
 	} else
 		core_alua_set_lba_map(dev, &lba_list,
 				      segment_size, segment_mult);
-	kfree(map_entries);
+	kfree(orig);
 	return count;
 }