From 4313eb6bba9624764b6d8192282eb36f7a557a5a Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Fri, 11 Jan 2013 12:08:57 +0100 Subject: [PATCH] udldrmfb: udl_get_edid: usb_control_msg buffer must not be on the stack commit 242187b362555849e8c971dfbbfd55f8bd9fa717 upstream. The buffer passed to usb_control_msg may end up in scatter-gather list, and may thus not be on the stack. Having it on the stack usually works on x86, but not on other archs. Signed-off-by: Hans de Goede Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/udl/udl_connector.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c index 86538c983542..a8c76f411c8c 100644 --- a/drivers/gpu/drm/udl/udl_connector.c +++ b/drivers/gpu/drm/udl/udl_connector.c @@ -22,13 +22,17 @@ static u8 *udl_get_edid(struct udl_device *udl) { u8 *block; - char rbuf[3]; + char *rbuf; int ret, i; block = kmalloc(EDID_LENGTH, GFP_KERNEL); if (block == NULL) return NULL; + rbuf = kmalloc(2, GFP_KERNEL); + if (rbuf == NULL) + goto error; + for (i = 0; i < EDID_LENGTH; i++) { ret = usb_control_msg(udl->ddev->usbdev, usb_rcvctrlpipe(udl->ddev->usbdev, 0), (0x02), @@ -42,10 +46,12 @@ static u8 *udl_get_edid(struct udl_device *udl) block[i] = rbuf[1]; } + kfree(rbuf); return block; error: kfree(block); + kfree(rbuf); return NULL; } -- 2.39.5