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V4L/DVB (12845): tm6000: more buffer handling fixes

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Before this patch, we were writing outside vmalloced buffer

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2008-11-28 07:39:00 -03:00
parent 1f9305b7a5
commit e8a4845d2a
1 changed files with 34 additions and 15 deletions
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49
drivers/staging/tm6000/tm6000-video.c
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@ -273,6 +273,11 @@ static int copy_packet(struct urb *urb, u32 header, u8 **ptr, u8 *endp,
get_next_buf (dma_q, buf);
if (!*buf)
return rc;
out_p = videobuf_to_vmalloc(&((*buf)->vb));
if (!out_p)
return rc;
pos = dev->isoc_ctl.pos = 0;
}
}
@ -420,6 +425,10 @@ static int copy_multiplexed(u8 *ptr, u8 *out_p, unsigned long len,
get_next_buf (dma_q, buf);
if (!*buf)
break;
out_p = videobuf_to_vmalloc(&((*buf)->vb));
if (!out_p)
return rc;
pos = 0;
}
}
@ -471,16 +480,25 @@ static void inline print_err_status (struct tm6000_core *dev,
/*
* Controls the isoc copy of each urb packet
*/
static inline int tm6000_isoc_copy(struct urb *urb, struct tm6000_buffer **buf)
static inline int tm6000_isoc_copy(struct urb *urb)
{
struct tm6000_dmaqueue *dma_q = urb->context;
struct tm6000_core *dev= container_of(dma_q,struct tm6000_core,vidq);
void *outp=videobuf_to_vmalloc (&((*buf)->vb));
struct tm6000_buffer *buf;
int i, len=0, rc=1;
int size=(*buf)->vb.size;
char *p;
int size;
char *outp = NULL, *p;
unsigned long copied;
get_next_buf(dma_q, &buf);
if (!buf)
outp = videobuf_to_vmalloc(&buf->vb);
if (!outp)
return 0;
size = buf->vb.size;
copied=0;
if (urb->status<0) {
@ -501,12 +519,12 @@ static inline int tm6000_isoc_copy(struct urb *urb, struct tm6000_buffer **buf)
// if (len>=TM6000_URB_MSG_LEN) {
p=urb->transfer_buffer + urb->iso_frame_desc[i].offset;
if (!urb->iso_frame_desc[i].status) {
if (((*buf)->fmt->fourcc)==V4L2_PIX_FMT_TM6000) {
rc=copy_multiplexed(p,outp,len,urb,buf);
if ((buf->fmt->fourcc)==V4L2_PIX_FMT_TM6000) {
rc=copy_multiplexed(p, outp, len, urb, &buf);
if (rc<=0)
return rc;
} else {
copy_streams(p,outp,len,urb,buf);
copy_streams(p, outp, len, urb, &buf);
}
}
copied += len;
@ -526,21 +544,22 @@ static inline int tm6000_isoc_copy(struct urb *urb, struct tm6000_buffer **buf)
*/
static void tm6000_irq_callback(struct urb *urb)
{
struct tm6000_buffer *buf = NULL;
struct tm6000_dmaqueue *dma_q = urb->context;
struct tm6000_core *dev = container_of(dma_q, struct tm6000_core, vidq);
unsigned long flags;
int i;
if (!dev)
return;
spin_lock_irqsave(&dev->slock, flags);
get_next_buf(dma_q, &buf);
if (buf)
tm6000_isoc_copy(urb, &buf);
spin_unlock_irqrestore(&dev->slock, flags);
spin_lock(&dev->slock);
tm6000_isoc_copy(urb);
spin_unlock(&dev->slock);
/* Reset urb buffers */
for (i = 0; i < urb->number_of_packets; i++) {
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = 0;
}
urb->status = usb_submit_urb(urb, GFP_ATOMIC);
if (urb->status)