On Thu, Sep 01, 2011 at 04:33:57PM +0200, Diego Calleja wrote:
> kmemleak found this:
> unreferenced object 0xffff8801b64af968 (size 512):
> comm "btrfs-cleaner", pid 3317, jiffies 4306810886 (age 903.272s)
> hex dump (first 32 bytes):
> 00 82 01 07 00 ea ff ff c0 83 01 07 00 ea ff ff ................
> 80 82 01 07 00 ea ff ff c0 87 01 07 00 ea ff ff ................
> backtrace:
> [<ffffffff816875cc>] kmemleak_alloc+0x5c/0xc0
> [<ffffffff8114aec3>] kmem_cache_alloc_trace+0x163/0x240
> [<ffffffff8127a290>] btrfs_defrag_file+0xf0/0xb20
> [<ffffffff8125d9a5>] btrfs_run_defrag_inodes+0x165/0x210
> [<ffffffff812479d7>] cleaner_kthread+0x177/0x190
> [<ffffffff81075c7d>] kthread+0x8d/0xa0
> [<ffffffff816af5f4>] kernel_thread_helper+0x4/0x10
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> "pages" is not always freed. Fix it removing the unnecesary additional return.
>
> Signed-off-by: Diego Calleja <dieg...@gmail.com>
Reviewed-by: David Sterba <dste...@suse.cz>
>
> ---
> fs/btrfs/ioctl.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> Index: linux/fs/btrfs/ioctl.c
> ===================================================================
> --- linux.orig/fs/btrfs/ioctl.c
> +++ linux/fs/btrfs/ioctl.c
> @@ -1130,17 +1130,15 @@ int btrfs_defrag_file(struct inode *inod
> disk_super = &root->fs_info->super_copy;
> features = btrfs_super_incompat_flags(disk_super);
> if (range->compress_type == BTRFS_COMPRESS_LZO) {
> features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
> btrfs_set_super_incompat_flags(disk_super, features);
> }
>
> - if (!file)
> - kfree(ra);
> - return defrag_count;
> + ret = defrag_count;
>
> out_ra:
> if (!file)
> kfree(ra);
> kfree(pages);
> return ret;
> }
> --
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