• Xiaotian Feng's avatar
    nfs: fix memory leak in nfs_get_sb with CONFIG_NFS_V4 · 9699eda6
    Xiaotian Feng authored
    With CONFIG_NFS_V4 and data version 4, nfs_get_sb will allocate memory for
    export_path in nfs4_validate_text_mount_data, so we need to free it then.
    This is addressed in following kmemleak report:
    
    unreferenced object 0xffff88016bf48a50 (size 16):
      comm "mount.nfs", pid 22567, jiffies 4651574704 (age 175471.200s)
      hex dump (first 16 bytes):
        2f 6f 70 74 2f 77 6f 72 6b 00 6b 6b 6b 6b 6b a5  /opt/work.kkkkk.
      backtrace:
        [<ffffffff814b34f9>] kmemleak_alloc+0x60/0xa7
        [<ffffffff81102c76>] kmemleak_alloc_recursive.clone.5+0x1b/0x1d
        [<ffffffff811046b3>] __kmalloc_track_caller+0x18f/0x1b7
        [<ffffffff810e1b08>] kstrndup+0x37/0x54
        [<ffffffffa0336971>] nfs_parse_devname+0x152/0x204 [nfs]
        [<ffffffffa0336af3>] nfs4_validate_text_mount_data+0xd0/0xdc [nfs]
        [<ffffffffa0338deb>] nfs_get_sb+0x325/0x736 [nfs]
        [<ffffffff81113671>] vfs_kern_mount+0xbd/0x17c
        [<ffffffff81113798>] do_kern_mount+0x4d/0xed
        [<ffffffff81129a87>] do_mount+0x787/0x7fe
        [<ffffffff81129b86>] sys_mount+0x88/0xc2
        [<ffffffff81009b42>] system_call_fastpath+0x16/0x1b
    Signed-off-by: default avatarXiaotian Feng <dfeng@redhat.com>
    Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
    Cc: Chuck Lever <chuck.lever@oracle.com>
    Cc: Benny Halevy <bhalevy@panasas.com>
    Cc: Al Viro <viro@ZenIV.linux.org.uk>
    Cc: Andy Adamson <andros@netapp.com>
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    9699eda6
super.c 74.4 KB