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USB: serial: keyspan: fix memleak on probe errors 

commit 910c996335 upstream.

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff888258228440 (size 64):
  comm "kworker/7:2", pid 2005, jiffies 4294989509 (age 824.540s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff8167939c>] slab_post_alloc_hook+0x9c/0x490
    [<ffffffff8167f627>] kmem_cache_alloc_trace+0x1f7/0x470
    [<ffffffffa02ac0e4>] keyspan_port_probe+0xa4/0x5d0 [keyspan]
    [<ffffffffa0294c07>] usb_serial_device_probe+0x97/0x1d0 [usbserial]
    [<ffffffff82b50ca7>] really_probe+0x167/0x460
    [<ffffffff82b51099>] __driver_probe_device+0xf9/0x180
    [<ffffffff82b51173>] driver_probe_device+0x53/0x130
    [<ffffffff82b516f5>] __device_attach_driver+0x105/0x130
    [<ffffffff82b4cfe9>] bus_for_each_drv+0x129/0x190
    [<ffffffff82b50a69>] __device_attach+0x1c9/0x270
    [<ffffffff82b518d0>] device_initial_probe+0x20/0x30
    [<ffffffff82b4f062>] bus_probe_device+0x142/0x160
    [<ffffffff82b4a4e9>] device_add+0x829/0x1300
    [<ffffffffa0295fda>] usb_serial_probe.cold+0xc9b/0x14ac [usbserial]
    [<ffffffffa02266aa>] usb_probe_interface+0x1aa/0x3c0 [usbcore]
    [<ffffffff82b50ca7>] really_probe+0x167/0x460

If keyspan_port_probe() fails to allocate memory for an out_buffer[i] or
in_buffer[i], the previously allocated memory for out_buffer or
in_buffer needs to be freed on the error handling path, otherwise a
memory leak will result.

Fixes: bad41a5bf1 ("USB: keyspan: fix port DMA-buffer allocations")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Link: https://lore.kernel.org/r/20211015085543.1203011-1-wanghai38@huawei.com
Cc: stable@vger.kernel.org      # 3.12
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wang Hai 2021-10-15 16:55:43 +08:00 committed by Greg Kroah-Hartman
parent 309d6b5d45
commit cefb16b7b2
1 changed files with 7 additions and 8 deletions
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15
drivers/usb/serial/keyspan.c
View File

@ -2890,22 +2890,22 @@ static int keyspan_port_probe(struct usb_serial_port *port)
for (i = 0; i < ARRAY_SIZE(p_priv->in_buffer); ++i) {
p_priv->in_buffer[i] = kzalloc(IN_BUFLEN, GFP_KERNEL);
if (!p_priv->in_buffer[i])
goto err_in_buffer;
goto err_free_in_buffer;
}
for (i = 0; i < ARRAY_SIZE(p_priv->out_buffer); ++i) {
p_priv->out_buffer[i] = kzalloc(OUT_BUFLEN, GFP_KERNEL);
if (!p_priv->out_buffer[i])
goto err_out_buffer;
goto err_free_out_buffer;
}
p_priv->inack_buffer = kzalloc(INACK_BUFLEN, GFP_KERNEL);
if (!p_priv->inack_buffer)
goto err_inack_buffer;
goto err_free_out_buffer;
p_priv->outcont_buffer = kzalloc(OUTCONT_BUFLEN, GFP_KERNEL);
if (!p_priv->outcont_buffer)
goto err_outcont_buffer;
goto err_free_inack_buffer;
p_priv->device_details = d_details;
@ -2951,15 +2951,14 @@ static int keyspan_port_probe(struct usb_serial_port *port)
return 0;
err_outcont_buffer:
err_free_inack_buffer:
kfree(p_priv->inack_buffer);
err_inack_buffer:
err_free_out_buffer:
for (i = 0; i < ARRAY_SIZE(p_priv->out_buffer); ++i)
kfree(p_priv->out_buffer[i]);
err_out_buffer:
err_free_in_buffer:
for (i = 0; i < ARRAY_SIZE(p_priv->in_buffer); ++i)
kfree(p_priv->in_buffer[i]);
err_in_buffer:
kfree(p_priv);
return -ENOMEM;