usb: dwc2: gadget: fix a memory use-after-free bug
When dwc2_hsotg_handle_unaligned_buf_complete() hs_req->req.buf already destroyed, in dwc2_hsotg_unmap_dma(), it touches hs_req->req.dma again, so dwc2_hsotg_unmap_dma() should be called before dwc2_hsotg_handle_unaligned_buf_complete(). Otherwise, it will cause a bad_page BUG, when allocate this memory page next time. This bug led to the following crash: BUG: Bad page state in process swapper/0 pfn:2bdbc [ 26.820440] page:eed76780 count:0 mapcount:0 mapping: (null) index:0x0 [ 26.854710] page flags: 0x200(arch_1) [ 26.885836] page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set [ 26.919179] bad because of flags: [ 26.948917] page flags: 0x200(arch_1) [ 26.979100] Modules linked in: [ 27.008401] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W3.14.0 #17 [ 27.041816] [<c010e1f8>] (unwind_backtrace) from [<c010a704>] (show_stack+0x20/0x24) [ 27.076108] [<c010a704>] (show_stack) from [<c087eea8>] (dump_stack+0x70/0x8c) [ 27.110246] [<c087eea8>] (dump_stack) from [<c01ce0b8>] (bad_page+0xfc/0x12c) [ 27.143958] [<c01ce0b8>] (bad_page) from [<c01ce65c>] (get_page_from_freelist+0x3e4/0x50c) [ 27.179298] [<c01ce65c>] (get_page_from_freelist) from [<c01ce9a0>] (__alloc_pages_nodemask) [ 27.216296] [<c01ce9a0>] (__alloc_pages_nodemask) from [<c01cf00c>] (__get_free_pages+0x20/) [ 27.252326] [<c01cf00c>] (__get_free_pages) from [<c01e5bec>] (kmalloc_order_trace+0x34/0xa) [ 27.288295] [<c01e5bec>] (kmalloc_order_trace) from [<c0203304>] (__kmalloc+0x40/0x1ac) [ 27.323751] [<c0203304>] (__kmalloc) from [<c052abc0>] (dwc2_hsotg_ep_queue.isra.12+0x7c/0x1) [ 27.359937] [<c052abc0>] (dwc2_hsotg_ep_queue.isra.12) from [<c052af88>] (dwc2_hsotg_ep_queue) [ 27.397478] [<c052af88>] (dwc2_hsotg_ep_queue_lock) from [<c0554110>] (rx_submit+0xfc/0x164) [ 27.433619] [<c0554110>] (rx_submit) from [<c05546e8>] (rx_complete+0x22c/0x230) [ 27.468872] [<c05546e8>] (rx_complete) from [<c052b528>] (dwc2_hsotg_complete_request+0xfc/0) [ 27.506240] [<c052b528>] (dwc2_hsotg_complete_request) from [<c052bba0>] (dwc2_hsotg_handle_o) [ 27.545401] [<c052bba0>] (dwc2_hsotg_handle_outdone) from [<c052be70>] (dwc2_hsotg_epint+0x2c) [ 27.583689] [<c052be70>] (dwc2_hsotg_epint) from [<c052c750>] (dwc2_hsotg_irq+0x1dc/0x4ac) [ 27.621041] [<c052c750>] (dwc2_hsotg_irq) from [<c01682e0>] (handle_irq_event_percpu+0x70/0x) [ 27.659066] [<c01682e0>] (handle_irq_event_percpu) from [<c01684ec>] (handle_irq_event+0x4c) [ 27.697322] [<c01684ec>] (handle_irq_event) from [<c016bae0>] (handle_fasteoi_irq+0xc8/0x11) [ 27.735451] [<c016bae0>] (handle_fasteoi_irq) from [<c0167b8c>] (generic_handle_irq+0x30/0x) [ 27.773918] [<c0167b8c>] (generic_handle_irq) from [<c0167ca4>] (__handle_domain_irq+0x84/0) [ 27.812018] [<c0167ca4>] (__handle_domain_irq) from [<c01003b0>] (gic_handle_irq+0x48/0x6c) [ 27.849695] [<c01003b0>] (gic_handle_irq) from [<c010b340>] (__irq_svc+0x40/0x50) [ 27.886907] Exception stack(0xc0d01ee0 to 0xc0d01f28) Acked-by: John Youn <johnyoun@synopsys.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Jeffy Chen <jeffy.chen@rock-chips.com> Signed-off-by: Yunzhi Li <lyz@rock-chips.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Yunzhi Li
Felipe Balbi
parent
21795c826a
commit
44583fecfd
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@ -1395,14 +1395,14 @@ static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg,
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if (hs_req->req.status == -EINPROGRESS)
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hs_req->req.status = result;
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if (using_dma(hsotg))
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dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
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dwc2_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, hs_req);
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hs_ep->req = NULL;
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list_del_init(&hs_req->queue);
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if (using_dma(hsotg))
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dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req);
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/*
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* call the complete request with the locks off, just in case the
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* request tries to queue more work for this endpoint.
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