From: Jesper Juhl Date: Sun, 2 Jan 2011 20:57:24 +0000 (-0300) Subject: [media] media, tlg2300: Fix memory leak in alloc_bulk_urbs_generic() X-Git-Tag: v2.6.38-rc2~1^2~40 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=fd01ad98945073faeb25391489caef4844f265c4;p=linux.git [media] media, tlg2300: Fix memory leak in alloc_bulk_urbs_generic() Hi, While reading drivers/media/video/tlg2300/pd-video.c::alloc_bulk_urbs_generic() I noticed that - We don't free the memory allocated to 'urb' if the call to usb_alloc_coherent() fails. - If the 'num' argument to the function is ever <= 0 we'll return an uninitialized variable 'i' to the caller. The following patch addresses both of the above by a) calling usb_free_urb() when usb_alloc_coherent() fails and by explicitly initializing 'i' to zero. I also moved the variables 'mem' and 'urb' inside the for loop. This does not actually make any difference, it just seemed more correct to me to let variables exist only in the innermost scope they are used. Signed-off-by: Jesper Juhl Acked-by: Huang Shijie Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/tlg2300/pd-video.c b/drivers/media/video/tlg2300/pd-video.c index a1ffe18640fe..df33a1d188bb 100644 --- a/drivers/media/video/tlg2300/pd-video.c +++ b/drivers/media/video/tlg2300/pd-video.c @@ -512,19 +512,20 @@ int alloc_bulk_urbs_generic(struct urb **urb_array, int num, int buf_size, gfp_t gfp_flags, usb_complete_t complete_fn, void *context) { - struct urb *urb; - void *mem; - int i; + int i = 0; - for (i = 0; i < num; i++) { - urb = usb_alloc_urb(0, gfp_flags); + for (; i < num; i++) { + void *mem; + struct urb *urb = usb_alloc_urb(0, gfp_flags); if (urb == NULL) return i; mem = usb_alloc_coherent(udev, buf_size, gfp_flags, &urb->transfer_dma); - if (mem == NULL) + if (mem == NULL) { + usb_free_urb(urb); return i; + } usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, ep_addr), mem, buf_size, complete_fn, context);