V4L/DVB: pvrusb2: Avoid using stack allocated buffers when performing USB I/O
Drivers shouldn't assume that the stack is DMA-safe.
[mchehab@redhat.com: fix patch description]
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index 301ef19..d13232d 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -4084,12 +4084,20 @@
void pvr2_hdw_cpureset_assert(struct pvr2_hdw *hdw,int val)
{
- char da[1];
+ char *da;
unsigned int pipe;
int ret;
if (!hdw->usb_dev) return;
+ da = kmalloc(16, GFP_KERNEL);
+
+ if (da == NULL) {
+ pvr2_trace(PVR2_TRACE_ERROR_LEGS,
+ "Unable to allocate memory to control CPU reset");
+ return;
+ }
+
pvr2_trace(PVR2_TRACE_INIT,"cpureset_assert(%d)",val);
da[0] = val ? 0x01 : 0x00;
@@ -4103,6 +4111,8 @@
"cpureset_assert(%d) error=%d",val,ret);
pvr2_hdw_render_useless(hdw);
}
+
+ kfree(da);
}