[MTD] [MAPS] physmap: fix wrong free and del_mtd_{partition,device}

commit 176bf2e0f10ecf1d20a97db3bd5bb2e6ba0b5668 ("physmap: fix leak of
memory returned by parse_mtd_partitions") deals with a memory leak and
frees the pointer array of mtd_partition after the call to
add_mtd_partitions().  the problem is that mtd_table[x]->name still points
to the freed memory.

Aldo physmap_flash_remove() should call del_mtd_partitions() or
del_mtd_device() only once.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Reported-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Tested-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 19 insertions, 19 deletions

diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index 87743661d48e..4b122e7ab4b3 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -29,6 +29,7 @@ struct physmap_flash_info {
         struct map_info         map[MAX_RESOURCES];
 #ifdef CONFIG_MTD_PARTITIONS
         int                     nr_parts;
+        struct mtd_partition    *parts;
 #endif
 };
 
@@ -45,25 +46,26 @@ static int physmap_flash_remove(struct platform_device *dev)
 
         physmap_data = dev->dev.platform_data;
 
-#ifdef CONFIG_MTD_CONCAT
-        if (info->cmtd != info->mtd[0]) {
+#ifdef CONFIG_MTD_PARTITIONS
+        if (info->nr_parts) {
+                del_mtd_partitions(info->cmtd);
+                kfree(info->parts);
+        } else if (physmap_data->nr_parts)
+                del_mtd_partitions(info->cmtd);
+        else
                 del_mtd_device(info->cmtd);
+#else
+        del_mtd_device(info->cmtd);
+#endif
+
+#ifdef CONFIG_MTD_CONCAT
+        if (info->cmtd != info->mtd[0])
                 mtd_concat_destroy(info->cmtd);
-        }
 #endif
 
         for (i = 0; i < MAX_RESOURCES; i++) {
-                if (info->mtd[i] != NULL) {
-#ifdef CONFIG_MTD_PARTITIONS
-                        if (info->nr_parts || physmap_data->nr_parts)
-                                del_mtd_partitions(info->mtd[i]);
-                        else
-                                del_mtd_device(info->mtd[i]);
-#else
-                        del_mtd_device(info->mtd[i]);
-#endif
+                if (info->mtd[i] != NULL)
                         map_destroy(info->mtd[i]);
-                }
         }
         return 0;
 }
@@ -86,9 +88,6 @@ static int physmap_flash_probe(struct platform_device *dev)
         int err = 0;
         int i;
         int devices_found = 0;
-#ifdef CONFIG_MTD_PARTITIONS
-        struct mtd_partition *parts;
-#endif
 
         physmap_data = dev->dev.platform_data;
         if (physmap_data == NULL)
@@ -167,10 +166,11 @@ static int physmap_flash_probe(struct platform_device *dev)
                 goto err_out;
 
 #ifdef CONFIG_MTD_PARTITIONS
-        err = parse_mtd_partitions(info->cmtd, part_probe_types, &parts, 0);
+        err = parse_mtd_partitions(info->cmtd, part_probe_types,
+                                &info->parts, 0);
         if (err > 0) {
-                add_mtd_partitions(info->cmtd, parts, err);
-                kfree(parts);
+                add_mtd_partitions(info->cmtd, info->parts, err);
+                info->nr_parts = err;
                 return 0;
         }