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38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
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From 83af063d6dec0439eb5abf3b19df2b4990e88e86 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Thu, 14 Apr 2016 17:01:17 +0200
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Subject: [PATCH] BACKPORT: usb: gadget: f_fs: Fix use-after-free
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(cherry picked from commit 38740a5b87d53ceb89eb2c970150f6e94e00373a)
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When using asynchronous read or write operations on the USB endpoints the
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issuer of the IO request is notified by calling the ki_complete() callback
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of the submitted kiocb when the URB has been completed.
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Calling this ki_complete() callback will free kiocb. Make sure that the
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structure is no longer accessed beyond that point, otherwise undefined
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behaviour might occur.
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Fixes: 2e4c7553cd6f ("usb: gadget: f_fs: add aio support")
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Cc: <stable@vger.kernel.org> # v3.15+
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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Change-Id: I3c7b643f6440c4fb6160a57c1058523030b46a6c
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Bug: 30950866
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---
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drivers/usb/gadget/function/f_fs.c | 1 -
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1 file changed, 1 deletion(-)
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diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
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index e389c27d8e202..599a4273d29d4 100644
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--- a/drivers/usb/gadget/function/f_fs.c
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+++ b/drivers/usb/gadget/function/f_fs.c
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@@ -689,7 +689,6 @@ static void ffs_user_copy_worker(struct work_struct *work)
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usb_ep_free_request(io_data->ep, io_data->req);
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- io_data->kiocb->private = NULL;
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if (io_data->read)
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kfree(io_data->iovec);
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kfree(io_data->buf);
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