5.4-stable review patch. If anyone has any objections, please let me know.
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From: Murad Masimov m.masimov@mt-integration.ru
commit 549f6d348167fb2f7800ed7c8d4bce9630c74498 upstream.
If streamzap_callback() receives an urb with any non-critical error status, i.e. any error code other than -ECONNRESET, -ENOENT or -ESHUTDOWN, it will try to process IR data, ignoring a possible transfer failure.
Make streamzap_callback() process IR data only when urb->status is 0. Move processing logic to a separate function to make code cleaner and more similar to the URB completion handlers in other RC drivers.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Fixes: 19770693c354 ("V4L/DVB: staging/lirc: add lirc_streamzap driver") Cc: stable@vger.kernel.org Signed-off-by: Murad Masimov m.masimov@mt-integration.ru Signed-off-by: Sean Young sean@mess.org Signed-off-by: Hans Verkuil hverkuil@xs4all.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/rc/streamzap.c | 68 ++++++++++++++++++++++++------------------- 1 file changed, 38 insertions(+), 30 deletions(-)
--- a/drivers/media/rc/streamzap.c +++ b/drivers/media/rc/streamzap.c @@ -182,39 +182,10 @@ static void sz_push_half_space(struct st sz_push_full_space(sz, value & SZ_SPACE_MASK); }
-/* - * streamzap_callback - usb IRQ handler callback - * - * This procedure is invoked on reception of data from - * the usb remote. - */ -static void streamzap_callback(struct urb *urb) +static void sz_process_ir_data(struct streamzap_ir *sz, int len) { - struct streamzap_ir *sz; unsigned int i; - int len; - - if (!urb) - return; - - sz = urb->context; - len = urb->actual_length; - - switch (urb->status) { - case -ECONNRESET: - case -ENOENT: - case -ESHUTDOWN: - /* - * this urb is terminated, clean up. - * sz might already be invalid at this point - */ - dev_err(sz->dev, "urb terminated, status: %d\n", urb->status); - return; - default: - break; - }
- dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len); for (i = 0; i < len; i++) { dev_dbg(sz->dev, "sz->buf_in[%d]: %x\n", i, (unsigned char)sz->buf_in[i]); @@ -267,6 +238,43 @@ static void streamzap_callback(struct ur }
ir_raw_event_handle(sz->rdev); +} + +/* + * streamzap_callback - usb IRQ handler callback + * + * This procedure is invoked on reception of data from + * the usb remote. + */ +static void streamzap_callback(struct urb *urb) +{ + struct streamzap_ir *sz; + int len; + + if (!urb) + return; + + sz = urb->context; + len = urb->actual_length; + + switch (urb->status) { + case 0: + dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len); + sz_process_ir_data(sz, len); + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* + * this urb is terminated, clean up. + * sz might already be invalid at this point + */ + dev_err(sz->dev, "urb terminated, status: %d\n", urb->status); + return; + default: + break; + } + usb_submit_urb(urb, GFP_ATOMIC);
return;