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Date: Wed, 17 Jun 2020 21:25:28 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Qiushi Wu <wu000273@....edu>, Felipe Balbi <balbi@...nel.org>, Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org Subject: [PATCH AUTOSEL 4.14 076/108] usb: gadget: fix potential double-free in m66592_probe. From: Qiushi Wu <wu000273@....edu> [ Upstream commit 44734a594196bf1d474212f38fe3a0d37a73278b ] m66592_free_request() is called under label "err_add_udc" and "clean_up", and m66592->ep0_req is not set to NULL after first free, leading to a double-free. Fix this issue by setting m66592->ep0_req to NULL after the first free. Fixes: 0f91349b89f3 ("usb: gadget: convert all users to the new udc infrastructure") Signed-off-by: Qiushi Wu <wu000273@....edu> Signed-off-by: Felipe Balbi <balbi@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/usb/gadget/udc/m66592-udc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/m66592-udc.c b/drivers/usb/gadget/udc/m66592-udc.c index 46ce7bc15f2b..53abad98af6d 100644 --- a/drivers/usb/gadget/udc/m66592-udc.c +++ b/drivers/usb/gadget/udc/m66592-udc.c @@ -1672,7 +1672,7 @@ static int m66592_probe(struct platform_device *pdev) err_add_udc: m66592_free_request(&m66592->ep[0].ep, m66592->ep0_req); - + m66592->ep0_req = NULL; clean_up3: if (m66592->pdata->on_chip) { clk_disable(m66592->clk); -- 2.25.1
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