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usb: gadget: uvc: fix sg handling during video encode 

In uvc_video_encode_isoc_sg, the uvc_request's sg list is
incorrectly being populated leading to corrupt video being
received by the remote end. When building the sg list the
usage of buf->sg's 'dma_length' field is not correct and
instead its 'length' field should be used.

Fixes: e81e7f9a0e ("usb: gadget: uvc: add scatter gather support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jeff Vanhoof <qjv001@motorola.com>
Signed-off-by: Dan Vacura <w36195@motorola.com>
Link: https://lore.kernel.org/r/20221018215044.765044-5-w36195@motorola.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeff Vanhoof 2022-10-18 16:50:40 -05:00 committed by Greg Kroah-Hartman
parent 0a0a2760b0
commit b57b08e6f4
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/gadget/function/uvc_video.c
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@ -157,10 +157,10 @@ uvc_video_encode_isoc_sg(struct usb_request *req, struct uvc_video *video,
sg = sg_next(sg);
for_each_sg(sg, iter, ureq->sgt.nents - 1, i) {
if (!len || !buf->sg || !sg_dma_len(buf->sg))
if (!len || !buf->sg || !buf->sg->length)
break;
sg_left = sg_dma_len(buf->sg) - buf->offset;
sg_left = buf->sg->length - buf->offset;
part = min_t(unsigned int, len, sg_left);
sg_set_page(iter, sg_page(buf->sg), part, buf->offset);