linux-kernel - [PATCH 1/2] ovl: free stack of paths in ovl_fill

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Message-ID: <20150721145843.11975.3849.stgit@buzz>
Date:	Tue, 21 Jul 2015 17:58:43 +0300
From:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:	linux-unionfs@...r.kernel.org, Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH 1/2] ovl: free stack of paths in ovl_fill_super

This fixes small memory leak after each successful mount.
Kmemleak report:

unreferenced object 0xffff88003683fe00 (size 16):
  comm "mount", pid 2029, jiffies 4294909563 (age 33.380s)
  hex dump (first 16 bytes):
    20 27 1f bb 00 88 ff ff 40 4b 0f 36 02 88 ff ff   '......@.......
  backtrace:
    [<ffffffff811f8cd4>] create_object+0x124/0x2c0
    [<ffffffff817a059b>] kmemleak_alloc+0x7b/0xc0
    [<ffffffff811dffe6>] __kmalloc+0x106/0x340
    [<ffffffffa01b7a29>] ovl_fill_super+0x389/0x9a0 [overlay]
    [<ffffffff81200ac4>] mount_nodev+0x54/0xa0
    [<ffffffffa01b7118>] ovl_mount+0x18/0x20 [overlay]
    [<ffffffff81201ab3>] mount_fs+0x43/0x170
    [<ffffffff81220d34>] vfs_kern_mount+0x74/0x170
    [<ffffffff812233ad>] do_mount+0x22d/0xdf0
    [<ffffffff812242cb>] SyS_mount+0x7b/0xc0
    [<ffffffff817b6bee>] entry_SYSCALL_64_fastpath+0x12/0x76
    [<ffffffffffffffff>] 0xffffffffffffffff

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Fixes: a78d9f0d5d5c ("ovl: support multiple lower layers")
---
 fs/overlayfs/super.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index a27572894eb1..ea9b1c20d48f 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1049,6 +1049,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 		oe->lowerstack[i].dentry = stack[i].dentry;
 		oe->lowerstack[i].mnt = ufs->lower_mnt[i];
 	}
+	kfree(stack);
 
 	root_dentry->d_fsdata = oe;
 

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