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authorJulia Lawall <julia@diku.dk>2010-05-26 14:42:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 09:12:41 -0700
commit7ca5ca60cba37fc4d8e99583da147faed3039ad0 (patch)
treec68aaea107be75e0c48ed330716bcfc3f61f87a7
parentb81d67a50c0f3021d170466388bec3e7fc3abe75 (diff)
fs/autofs4: use memdup_user
Use memdup_user when user data is immediately copied into the allocated region. Elimination of the variable ads, which is no longer useful. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Cc: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/autofs4/dev-ioctl.c13
1 files changed, 2 insertions, 11 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index d832062869f6..ba4a38b9c22f 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -95,7 +95,7 @@ static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
*/
static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
{
- struct autofs_dev_ioctl tmp, *ads;
+ struct autofs_dev_ioctl tmp;
if (copy_from_user(&tmp, in, sizeof(tmp)))
return ERR_PTR(-EFAULT);
@@ -103,16 +103,7 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
if (tmp.size < sizeof(tmp))
return ERR_PTR(-EINVAL);
- ads = kmalloc(tmp.size, GFP_KERNEL);
- if (!ads)
- return ERR_PTR(-ENOMEM);
-
- if (copy_from_user(ads, in, tmp.size)) {
- kfree(ads);
- return ERR_PTR(-EFAULT);
- }
-
- return ads;
+ return memdup_user(in, tmp.size);
}
static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)