UBI: fix memory leak

ubi_free_volume() function sets ubi->volumes[] to NULL, so
ubi_eba_close() is useless, it does not free what has to be freed.
So zap it and free vol->eba_tbl at the volume release function.

Pointed-out-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

4 files changed, 9 insertions, 29 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index ff4425de1527..7b42b4d05b3a 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -840,7 +840,6 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
 out_uif:
         uif_close(ubi);
 out_detach:
-        ubi_eba_close(ubi);
         ubi_wl_close(ubi);
         vfree(ubi->vtbl);
 out_free:
@@ -903,7 +902,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
                 kthread_stop(ubi->bgt_thread);
 
         uif_close(ubi);
-        ubi_eba_close(ubi);
         ubi_wl_close(ubi);
         vfree(ubi->vtbl);
         put_mtd_device(ubi->mtd);
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 37d778447943..623d25f4855f 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -1233,20 +1233,3 @@ out_free:
         }
         return err;
 }
-
-/**
- * ubi_eba_close - close EBA unit.
- * @ubi: UBI device description object
- */
-void ubi_eba_close(const struct ubi_device *ubi)
-{
-        int i, num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
-
-        dbg_eba("close EBA unit");
-
-        for (i = 0; i < num_volumes; i++) {
-                if (!ubi->volumes[i])
-                        continue;
-                kfree(ubi->volumes[i]->eba_tbl);
-        }
-}
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 67dcbd11c15c..940f6b7deec3 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -477,7 +477,6 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
                      struct ubi_vid_hdr *vid_hdr);
 int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si);
-void ubi_eba_close(const struct ubi_device *ubi);
 
 /* wl.c */
 int ubi_wl_get_peb(struct ubi_device *ubi, int dtype);
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 7402025ded94..367b04176e0a 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -127,6 +127,7 @@ static void vol_release(struct device *dev)
 {
         struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
 
+        kfree(vol->eba_tbl);
         kfree(vol);
 }
 
@@ -201,7 +202,7 @@ static void volume_sysfs_close(struct ubi_volume *vol)
  */
 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 {
-        int i, err, vol_id = req->vol_id, dont_free = 0;
+        int i, err, vol_id = req->vol_id, do_free = 1;
         struct ubi_volume *vol;
         struct ubi_vtbl_record vtbl_rec;
         uint64_t bytes;
@@ -365,14 +366,14 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 
 out_sysfs:
         /*
-         * We have registered our device, we should not free the volume*
+         * We have registered our device, we should not free the volume
          * description object in this function in case of an error - it is
          * freed by the release function.
          *
          * Get device reference to prevent the release function from being
          * called just after sysfs has been closed.
          */
-        dont_free = 1;
+        do_free = 0;
         get_device(&vol->dev);
         volume_sysfs_close(vol);
 out_gluebi:
@@ -382,17 +383,18 @@ out_gluebi:
 out_cdev:
         cdev_del(&vol->cdev);
 out_mapping:
-        kfree(vol->eba_tbl);
+        if (do_free)
+                kfree(vol->eba_tbl);
 out_acc:
         spin_lock(&ubi->volumes_lock);
         ubi->rsvd_pebs -= vol->reserved_pebs;
         ubi->avail_pebs += vol->reserved_pebs;
 out_unlock:
         spin_unlock(&ubi->volumes_lock);
-        if (dont_free)
-                put_device(&vol->dev);
-        else
+        if (do_free)
                 kfree(vol);
+        else
+                put_device(&vol->dev);
         ubi_err("cannot create volume %d, error %d", vol_id, err);
         return err;
 }
@@ -445,8 +447,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc)
                         goto out_err;
         }
 
-        kfree(vol->eba_tbl);
-        vol->eba_tbl = NULL;
         cdev_del(&vol->cdev);
         volume_sysfs_close(vol);