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usbip: Fix free of unallocated memory in vhci tx 

iso_buffer should be set to NULL after use and free in the while loop.
In the case of isochronous URB in the while loop, iso_buffer is
allocated and after sending it to server, buffer is deallocated. And
then, if the next URB in the while loop is not a isochronous pipe,
iso_buffer still holds the previously deallocated buffer address and
kfree tries to free wrong buffer address.

Fixes: ea44d19076 ("usbip: Implement SG support to vhci-hcd and stub driver")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>
Reviewed-by: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20191022093017.8027-1-suwan.kim027@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Suwan Kim 2019-10-22 18:30:17 +09:00 committed by Greg Kroah-Hartman
parent 28df0642ab
commit d4d8257754
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/usbip/vhci_tx.c
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@ -147,7 +147,10 @@ static int vhci_send_cmd_submit(struct vhci_device *vdev)
}
kfree(iov);
/* This is only for isochronous case */
kfree(iso_buffer);
iso_buffer = NULL;
usbip_dbg_vhci_tx("send txdata\n");
total_size += txsize;