diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2013-01-11 12:08:57 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-01-14 08:44:33 +1000 |
| commit | 242187b362555849e8c971dfbbfd55f8bd9fa717 (patch) | |
| tree | 6ec50cb4197fdf8a5d1ad8391d483f6f33ec7dbd | |
| parent | c930812fe5ebe725760422c9c351d1f6fde1502d (diff) | |
udldrmfb: udl_get_edid: usb_control_msg buffer must not be on the stack
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 <hdegoede@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/udl/udl_connector.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c index 3e6208f773e2..353bc1ea6f68 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; } |