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authorJulia Lawall <julia@diku.dk>2010-08-09 17:18:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:44:54 -0700
commit90d7404558fbe6f369d5e27b5ea3ef1e57562d3d (patch)
tree0dbd7ef38a1e9e95b6c9aeb03d8d549ea5cf6141 /mm/util.c
parent9e58143dc08123c22c5b9f782b2913bd3a07a03d (diff)
downloadlinux-90d7404558fbe6f369d5e27b5ea3ef1e57562d3d.tar.gz
mm: use memdup_user
Use memdup_user when user data is immediately copied into the allocated region. 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: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/mm/util.c b/mm/util.c
index f5712e8964b..4735ea48181 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -225,15 +225,10 @@ char *strndup_user(const char __user *s, long n)
if (length > n)
return ERR_PTR(-EINVAL);
- p = kmalloc(length, GFP_KERNEL);
+ p = memdup_user(s, length);
- if (!p)
- return ERR_PTR(-ENOMEM);
-
- if (copy_from_user(p, s, length)) {
- kfree(p);
- return ERR_PTR(-EFAULT);
- }
+ if (IS_ERR(p))
+ return p;
p[length - 1] = '\0';