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// SPDX-License-Identifier: GPL-2.0-only
/// Remove casting the values returned by memory allocation functions
/// like kmalloc, kzalloc, kmem_cache_alloc, kmem_cache_zalloc etc.
///
//# This makes an effort to find cases of casting of values returned by
//# kmalloc, kzalloc, kcalloc, kmem_cache_alloc, kmem_cache_zalloc,
//# kmem_cache_alloc_node, kmalloc_node and kzalloc_node and removes
//# the casting as it is not required. The result in the patch case may
//# need some reformatting.
//
// Confidence: High
// Copyright: (C) 2014 Himangi Saraogi
// Copyright: (C) 2017 Himanshu Jha
// Comments:
// Options: --no-includes --include-headers
//
virtual context
virtual patch
virtual org
virtual report
@m1@
identifier i;
expression e;
type T;
position p1;
@@
#define i (T@p1 *)e
@m2@
identifier i;
expression e;
type T;
position p2;
@@
#define i(...) (T@p2 *)e
@initialize:python@
@@
import re
pattern = '__'
m = re.compile(pattern)
@r1 depends on context || patch@
type T;
position p != {m1.p1,m2.p2};
@@
(T@p *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|
vmalloc_node\|vzalloc_node\)(...)
//----------------------------------------------------------
// For context mode
//----------------------------------------------------------
@script:python depends on context@
t << r1.T;
@@
if m.search(t) != None:
cocci.include_match(False)
@depends on context && r1@
type r1.T;
@@
* (T *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|
vmalloc_node\|vzalloc_node\)(...)
//----------------------------------------------------------
// For patch mode
//----------------------------------------------------------
@script:python depends on patch@
t << r1.T;
@@
if m.search(t) != None:
cocci.include_match(False)
@depends on patch && r1@
type r1.T;
@@
- (T *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|
vmalloc_node\|vzalloc_node\)(...)
//----------------------------------------------------------
// For org and report mode
//----------------------------------------------------------
@r2 depends on org || report@
type T;
position p != {m1.p1,m2.p2};
@@
(T@p *)
\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\|
kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|
vmalloc_node\|vzalloc_node\)(...)
@script:python depends on org@
p << r2.p;
t << r2.T;
@@
if m.search(t) != None:
cocci.include_match(False)
else:
coccilib.org.print_safe_todo(p[0], t)
@script:python depends on report@
p << r2.p;
t << r2.T;
@@
if m.search(t) != None:
cocci.include_match(False)
else:
msg="WARNING: casting value returned by memory allocation function to (%s *) is useless." % (t)
coccilib.report.print_report(p[0], msg)
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