ubifs: Fix memory leak from c->sup_node

The c->sup_node is allocated in function ubifs_read_sb_node but
is not freed. This will cause memory leak as below:

unreferenced object 0xbc9ce000 (size 4096):
  comm "mount", pid 500, jiffies 4294952946 (age 315.820s)
  hex dump (first 32 bytes):
    31 18 10 06 06 7b f1 11 02 00 00 00 00 00 00 00  1....{..........
    00 10 00 00 06 00 00 00 00 00 00 00 08 00 00 00  ................
  backtrace:
    [<d1c503cd>] ubifs_read_superblock+0x48/0xebc
    [<a20e14bd>] ubifs_mount+0x974/0x1420
    [<8589ecc3>] legacy_get_tree+0x2c/0x50
    [<5f1fb889>] vfs_get_tree+0x28/0xfc
    [<bbfc7939>] do_mount+0x4f8/0x748
    [<4151f538>] ksys_mount+0x78/0xa0
    [<d59910a9>] ret_fast_syscall+0x0/0x54
    [<1cc40005>] 0x7ea02790

Free it in ubifs_umount and in the error path of mount_ubifs.

Fixes: fd6150051bec ("ubifs: Store read superblock node")
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 5e1e8ec..7fc2f3f 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1599,6 +1599,7 @@ out_free:
        vfree(c->ileb_buf);
        vfree(c->sbuf);
        kfree(c->bottom_up_buf);
+       kfree(c->sup_node);
        ubifs_debugging_exit(c);
        return err;
 }
@@ -1641,6 +1642,7 @@ static void ubifs_umount(struct ubifs_info *c)
        vfree(c->ileb_buf);
        vfree(c->sbuf);
        kfree(c->bottom_up_buf);
+       kfree(c->sup_node);
        ubifs_debugging_exit(c);
 }