• Jaswinder Singh Rajput's avatar
    ALSA: OSS sequencer should be initialized after snd_seq_system_client_init · f96e0808
    Jaswinder Singh Rajput authored
    When build SND_SEQUENCER in kernel then OSS sequencer(alsa_seq_oss_init)
    is initialized before System (snd_seq_system_client_init) which leads to
    memory leak :
    
    unreferenced object 0xf6b0e680 (size 256):
      comm "swapper", pid 1, jiffies 4294670753
      backtrace:
        [<c108ac5c>] create_object+0x135/0x204
        [<c108adfe>] kmemleak_alloc+0x26/0x4c
        [<c1087de2>] kmem_cache_alloc+0x72/0xff
        [<c126d2ac>] seq_create_client1+0x22/0x160
        [<c126e3b6>] snd_seq_create_kernel_client+0x72/0xef
        [<c1485a05>] snd_seq_oss_create_client+0x86/0x142
        [<c1485920>] alsa_seq_oss_init+0xf6/0x155
        [<c1001059>] do_one_initcall+0x4f/0x111
        [<c14655be>] kernel_init+0x115/0x166
        [<c10032af>] kernel_thread_helper+0x7/0x10
        [<ffffffff>] 0xffffffff
    unreferenced object 0xf688a580 (size 64):
      comm "swapper", pid 1, jiffies 4294670753
      backtrace:
        [<c108ac5c>] create_object+0x135/0x204
        [<c108adfe>] kmemleak_alloc+0x26/0x4c
        [<c1087de2>] kmem_cache_alloc+0x72/0xff
        [<c126f964>] snd_seq_pool_new+0x1c/0xb8
        [<c126d311>] seq_create_client1+0x87/0x160
        [<c126e3b6>] snd_seq_create_kernel_client+0x72/0xef
        [<c1485a05>] snd_seq_oss_create_client+0x86/0x142
        [<c1485920>] alsa_seq_oss_init+0xf6/0x155
        [<c1001059>] do_one_initcall+0x4f/0x111
        [<c14655be>] kernel_init+0x115/0x166
        [<c10032af>] kernel_thread_helper+0x7/0x10
        [<ffffffff>] 0xffffffff
    unreferenced object 0xf6b0e480 (size 256):
      comm "swapper", pid 1, jiffies 4294670754
      backtrace:
        [<c108ac5c>] create_object+0x135/0x204
        [<c108adfe>] kmemleak_alloc+0x26/0x4c
        [<c1087de2>] kmem_cache_alloc+0x72/0xff
        [<c12725a0>] snd_seq_create_port+0x51/0x21c
        [<c126de50>] snd_seq_ioctl_create_port+0x57/0x13c
        [<c126d07a>] snd_seq_do_ioctl+0x4a/0x69
        [<c126d0de>] snd_seq_kernel_client_ctl+0x33/0x49
        [<c1485a74>] snd_seq_oss_create_client+0xf5/0x142
        [<c1485920>] alsa_seq_oss_init+0xf6/0x155
        [<c1001059>] do_one_initcall+0x4f/0x111
        [<c14655be>] kernel_init+0x115/0x166
        [<c10032af>] kernel_thread_helper+0x7/0x10
        [<ffffffff>] 0xffffffff
    
    The correct order should be :
    
    System (snd_seq_system_client_init) should be initialized before
    OSS sequencer(alsa_seq_oss_init) which is equivalent to :
    
    1. insmod sound/core/seq/snd-seq-device.ko
    2. insmod sound/core/seq/snd-seq.ko
    3. insmod sound/core/seq/snd-seq-midi-event.ko
    4. insmod sound/core/seq/oss/snd-seq-oss.ko
    
    Including sound/core/seq/oss/Makefile after other seq modules
    fixes the ordering and memory leak.
    Signed-off-by: default avatarJaswinder Singh Rajput <jaswinderrajput@gmail.com>
    Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
    f96e0808
Makefile 1.16 KB