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author | Mans Rullgard <mans@mansr.com> | 2020-03-16 22:11:35 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-17 20:03:28 +0100 |
commit | 52974d94a206ce428d9d9b6eaa208238024be82a (patch) | |
tree | e32d8daf2cd47c9d9caf725280c120a27f1271ed /drivers/usb/Makefile | |
parent | usb: musb: jz4740: Add support for the JZ4770 (diff) | |
download | linux-52974d94a206ce428d9d9b6eaa208238024be82a.tar.xz linux-52974d94a206ce428d9d9b6eaa208238024be82a.zip |
usb: musb: fix crash with highmen PIO and usbmon
When handling a PIO bulk transfer with highmem buffer, a temporary
mapping is assigned to urb->transfer_buffer. After the transfer is
complete, an invalid address is left behind in this pointer. This is
not ordinarily a problem since nothing touches that buffer before the
urb is released. However, when usbmon is active, usbmon_urb_complete()
calls (indirectly) mon_bin_get_data() which does access the transfer
buffer if it is set. To prevent an invalid memory access here, reset
urb->transfer_buffer to NULL when finished (musb_host_rx()), or do not
set it at all (musb_host_tx()).
Fixes: 8e8a55165469 ("usb: musb: host: Handle highmem in PIO mode")
Signed-off-by: Mans Rullgard <mans@mansr.com>
Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200316211136.2274-8-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions