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authorBin Liu <b-liu@ti.com>2018-04-30 11:20:54 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-09 09:51:55 +0200
commit87fa7da673b4e8911cf0a36a270dc247e558930e (patch)
tree247fc1990a401591156c4e7274d58d364170ece3
parent303e99bde8dcb6beaa6be738e025f9f9dd2703f1 (diff)
usb: musb: trace: fix NULL pointer dereference in musb_g_tx()
commit 9aea9b6cc78d2b99b23d84fb2e0bc6e464c6569e upstream. 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>
-rw-r--r--drivers/usb/musb/musb_gadget.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index bc6d1717c9ec..87f932d4b72c 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -442,7 +442,6 @@ 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);
@@ -481,6 +480,8 @@ 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;