diff options
| author |   Bin Liu <b-liu@ti.com> | 2018-04-30 11:20:54 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-30 09:52:17 -0700 |
| commit | 9aea9b6cc78d2b99b23d84fb2e0bc6e464c6569e (patch) | |
| tree | 9cc53a135cd4ec44af2ee6f0059045e9911c76cb /drivers/usb/musb/musb_gadget.c | |
| parent | usb: musb: host: fix potential NULL pointer dereference (diff) | |
| download | linux-dev-9aea9b6cc78d2b99b23d84fb2e0bc6e464c6569e.tar.xz linux-dev-9aea9b6cc78d2b99b23d84fb2e0bc6e464c6569e.zip | |
usb: musb: trace: fix NULL pointer dereference in musb_g_tx()
The usb_request pointer could be NULL in musb_g_tx(), where the
tracepoint call would trigger the NULL pointer dereference failure when
parsing the members of the usb_request pointer.
Move the tracepoint call to where the usb_request pointer is already
checked to solve the issue.
Fixes: fc78003e5345 ("usb: musb: gadget: add usb-request tracepoints")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/musb/musb_gadget.c')
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index e564695c6c8d..71c5835ea9cd 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -417,7 +417,6 @@ void musb_g_tx(struct musb *musb, u8 epnum) req = next_request(musb_ep); request = &req->request; - trace_musb_req_tx(req); csr = musb_readw(epio, MUSB_TXCSR); musb_dbg(musb, "<== %s, txcsr %04x", musb_ep->end_point.name, csr); @@ -456,6 +455,8 @@ void musb_g_tx(struct musb *musb, u8 epnum) u8 is_dma = 0; bool short_packet = false; + trace_musb_req_tx(req); + if (dma && (csr & MUSB_TXCSR_DMAENAB)) { is_dma = 1; csr |= MUSB_TXCSR_P_WZC_BITS; |