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coccinelle: api: extend memdup_user transformation with GFP_USER

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Match GFP_USER and optional __GFP_NOWARN allocations with
memdup_user.cocci rule.
Commit 6c2c97a24f ("memdup_user(): switch to GFP_USER") switched
memdup_user() from GFP_KERNEL to GFP_USER. In almost all cases it
is still a good idea to recommend memdup_user() for GFP_KERNEL
allocations. The motivation behind altering memdup_user() to GFP_USER:
https://lkml.org/lkml/2018/1/6/333

Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
This commit is contained in:
Denis Efremov 2020-07-20 19:22:14 +03:00 committed by Julia Lawall
parent 7cf4be68b1
commit 547ade42ce
1 changed files with 6 additions and 2 deletions
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8
scripts/coccinelle/api/memdup_user.cocci
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@ -20,7 +20,9 @@ expression from,to,size;
identifier l1,l2;
@@
- to = \(kmalloc\|kzalloc\)(size,GFP_KERNEL);
- to = \(kmalloc\|kzalloc\)
- (size,\(GFP_KERNEL\|GFP_USER\|
- \(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
+ to = memdup_user(from,size);
if (
- to==NULL
@ -43,7 +45,9 @@ position p;
statement S1,S2;
@@
* to = \(kmalloc@p\|kzalloc@p\)(size,GFP_KERNEL);
* to = \(kmalloc@p\|kzalloc@p\)
(size,\(GFP_KERNEL\|GFP_USER\|
\(GFP_KERNEL\|GFP_USER\)|__GFP_NOWARN\));
if (to==NULL || ...) S1
if (copy_from_user(to, from, size) != 0)
S2