From: Julia Lawall <julia@xxxxxxx> Error handling code following a kzalloc should free the allocated data. Similarly for usb-alloc urb. The semantic match that finds the first problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...); ... if (x == NULL) S <... when != x when != if (...) { <+...x...+> } ( x->f1 = E | (x->f1 == NULL || ...) | f(...,x->f1,...) ) ...> ( return \(0\|<+...x...+>\|ptr\); | return@p2 ...; ) @script:python@ p1 << r.p1; p2 << r.p2; @@ print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- drivers/media/video/hdpvr/hdpvr-video.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/media/video/hdpvr/hdpvr-video.c b/drivers/media/video/hdpvr/hdpvr-video.c index 2eb9dc2..b5439ca 100644 --- a/drivers/media/video/hdpvr/hdpvr-video.c +++ b/drivers/media/video/hdpvr/hdpvr-video.c @@ -139,7 +139,7 @@ int hdpvr_alloc_buffers(struct hdpvr_device *dev, uint count) urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) { v4l2_err(&dev->v4l2_dev, "cannot allocate urb\n"); - goto exit; + goto exit_urb; } buf->urb = urb; @@ -148,7 +148,7 @@ int hdpvr_alloc_buffers(struct hdpvr_device *dev, uint count) if (!mem) { v4l2_err(&dev->v4l2_dev, "cannot allocate usb transfer buffer\n"); - goto exit; + goto exit_urb_buffer; } usb_fill_bulk_urb(buf->urb, dev->udev, @@ -161,6 +161,10 @@ int hdpvr_alloc_buffers(struct hdpvr_device *dev, uint count) list_add_tail(&buf->buff_list, &dev->free_buff_list); } return 0; +exit_urb_buffer: + usb_free_urb(urb); +exit_urb: + kfree(buf); exit: hdpvr_free_buffers(dev); return retval; -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
