target: Fix a memory leak in target_dev_lba_map_store()

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@sandisk.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 9ef0893..3327c49 100644 (file)
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -2017,14 +2017,14 @@ static ssize_t target_dev_lba_map_store(struct config_item *item,
        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;
 
@@ -2122,7 +2122,7 @@ out:
        } else
                core_alua_set_lba_map(dev, &lba_list,
                                      segment_size, segment_mult);
-       kfree(map_entries);
+       kfree(orig);
        return count;
 }