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authorJulia Lawall <julia@diku.dk>2011-05-26 16:25:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-26 17:12:37 -0700
commitd98808a253f209465ed9f415c565f4c294a213b8 (patch)
tree4d60da0dc3a2ad367edbb2c3c51c352bce7da918 /drivers/char/ppdev.c
parente2e77098764636456ba7092a8b3b3b34b2a8e8d8 (diff)
downloadleg-kernel-d98808a253f209465ed9f415c565f4c294a213b8.tar.gz
drivers/char/ppdev.c: put gotten port value
parport_find_number() calls parport_get_port() on its result, so there should be a corresponding call to parport_put_port() before dropping the reference. Similar code is found in the function register_device() in the same file. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @exists@ local idexpression struct parport * x; expression ra,rr; statement S1,S2; @@ x = parport_find_number(...) ... when != x = rr when any when != parport_put_port(x,...) when != if (...) { ... parport_put_port(x,...) ...} ( if(<+...x...+>) S1 else S2 | if(...) { ... when != x = ra when forall when != parport_put_port(x,...) *return...; } ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/ppdev.c')
-rw-r--r--drivers/char/ppdev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index f176dbaeb15a..3fcf80ff12f2 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -457,6 +457,7 @@ static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return -ENODEV;
modes = port->modes;
+ parport_put_port(port);
if (copy_to_user (argp, &modes, sizeof (modes))) {
return -EFAULT;
}