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f2fs: fix memory leak of kobject in error path of fill_super

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f2fs_sb_info::s_kobj should be released in error path of fill_super,
otherwise it will lead to memory leak.

This bug was found by kmemleak:

dmesg:
kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8800838dc358 (size 8):
  comm "mount", pid 4154, jiffies 4297482839 (age 1911.412s)
  hex dump (first 8 bytes):
    7a 72 61 6d 31 00 ff ff                          zram1...
  backtrace:
    [<ffffffff817a3668>] kmemleak_alloc+0x28/0x50
    [<ffffffff811dc99f>] __kmalloc_track_caller+0xef/0x1c0
    [<ffffffff8119d1c5>] kstrdup+0x45/0x80
    [<ffffffff8119d228>] kstrdup_const+0x28/0x30
    [<ffffffff813d2333>] kvasprintf_const+0x63/0xa0
    [<ffffffff813c59fc>] kobject_set_name_vargs+0x3c/0xa0
    [<ffffffff813c5a85>] kobject_add_varg+0x25/0x60
    [<ffffffff813c5b13>] kobject_init_and_add+0x53/0x70
    [<ffffffffa07ced19>] f2fs_fill_super+0x9d9/0xc40 [f2fs]
    [<ffffffff811ff0b2>] mount_bdev+0x192/0x1d0
    [<ffffffffa07cd3e5>] f2fs_mount+0x15/0x20 [f2fs]
    [<ffffffff811fec93>] mount_fs+0x43/0x170
    [<ffffffff81220256>] vfs_kern_mount+0x76/0x160
    [<ffffffff812211c8>] do_mount+0x258/0xdc0
    [<ffffffff81221dab>] SyS_mount+0x7b/0xc0
    [<ffffffff817aecd7>] entry_SYSCALL_64_fastpath+0x12/0x6f
...

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-11-16 20:38:25 +08:00 committed by Jaegeuk Kim
parent 4bb9998d38
commit 29ba108d9b
1 changed files with 2 additions and 0 deletions
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2
fs/f2fs/super.c
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@ -1361,6 +1361,8 @@ try_onemore:
free_kobj:
kobject_del(&sbi->s_kobj);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
free_proc:
if (sbi->s_proc) {
remove_proc_entry("segment_info", sbi->s_proc);