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V4L/DVB: drivers/media/video/em28xx: Remove potential NULL dereference 

If the NULL test is necessary, the initialization involving a dereference of
the tested value should be moved after the NULL test.

The sematic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
expression E;
identifier i,fld;
statement S;
@@

- T i = E->fld;
+ T i;
  ... when != E
      when != i
  if (E == NULL) S
+ i = E->fld;
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Julia Lawall 2010-08-27 02:57:18 -03:00 committed by Mauro Carvalho Chehab
parent d7ef485daa
commit 6b81bef8cd
1 changed files with 2 additions and 1 deletions
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3
drivers/media/video/em28xx/em28xx-video.c
View File

@ -277,12 +277,13 @@ static void em28xx_copy_vbi(struct em28xx *dev,
{ {
void *startwrite, *startread; void *startwrite, *startread;
int offset; int offset;
int bytesperline = dev->vbi_width; int bytesperline;
if (dev == NULL) { if (dev == NULL) {
em28xx_isocdbg("dev is null\n"); em28xx_isocdbg("dev is null\n");
return; return;
} }
bytesperline = dev->vbi_width;
if (dma_q == NULL) { if (dma_q == NULL) {
em28xx_isocdbg("dma_q is null\n"); em28xx_isocdbg("dma_q is null\n");