From: Suwan Kim <suwan.kim027@gmail.com>
Date: Tue, 22 Oct 2019 18:30:17 +0900
Subject: usbip: Fix free of unallocated memory in vhci tx
Git-commit: d4d8257754c3300ea2a465dadf8d2b02c713c920
Patch-mainline: 5.4-rc6
References: bnc#1151927 5.3.11
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: ea44d190764b ("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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/usbip/vhci_tx.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/usbip/vhci_tx.c
+++ b/drivers/usb/usbip/vhci_tx.c
@@ -147,7 +147,10 @@ static int vhci_send_cmd_submit(struct v
}
kfree(iov);
+ /* This is only for isochronous case */
kfree(iso_buffer);
+ iso_buffer = NULL;
+
usbip_dbg_vhci_tx("send txdata\n");
total_size += txsize;