6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thinh Nguyen Thinh.Nguyen@synopsys.com
commit b7fc65f5141c24785dc8c19249ca4efcf71b3524 upstream.
The dwc3_request->num_queued_sgs is decremented on completion. If a partially completed request is handled, then the dwc3_request->num_queued_sgs no longer reflects the total number of num_queued_sgs (it would be cleared).
Correctly check the number of request SG entries remained to be prepare and queued. Failure to do this may cause null pointer dereference when accessing non-existent SG entry.
Cc: stable@vger.kernel.org Fixes: c96e6725db9d ("usb: dwc3: gadget: Correct the logic for queuing sgs") Signed-off-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/d07a7c4aa0fcf746cdca0515150dbe5c52000af7.173154578... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1436,8 +1436,8 @@ static int dwc3_prepare_trbs_sg(struct d struct scatterlist *s; int i; unsigned int length = req->request.length; - unsigned int remaining = req->request.num_mapped_sgs - - req->num_queued_sgs; + unsigned int remaining = req->num_pending_sgs; + unsigned int num_queued_sgs = req->request.num_mapped_sgs - remaining; unsigned int num_trbs = req->num_trbs; bool needs_extra_trb = dwc3_needs_extra_trb(dep, req);
@@ -1445,7 +1445,7 @@ static int dwc3_prepare_trbs_sg(struct d * If we resume preparing the request, then get the remaining length of * the request and resume where we left off. */ - for_each_sg(req->request.sg, s, req->num_queued_sgs, i) + for_each_sg(req->request.sg, s, num_queued_sgs, i) length -= sg_dma_len(s);
for_each_sg(sg, s, remaining, i) {