| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /// Remove casting the values returned by memory allocation functions |
| 3 | /// like kmalloc, kzalloc, kmem_cache_alloc, kmem_cache_zalloc etc. |
| 4 | /// |
| 5 | //# This makes an effort to find cases of casting of values returned by |
| 6 | //# kmalloc, kzalloc, kcalloc, kmem_cache_alloc, kmem_cache_zalloc, |
| 7 | //# kmem_cache_alloc_node, kmalloc_node and kzalloc_node and removes |
| 8 | //# the casting as it is not required. The result in the patch case may |
| 9 | //# need some reformatting. |
| 10 | // |
| 11 | // Confidence: High |
| 12 | // Copyright: (C) 2014 Himangi Saraogi |
| 13 | // Copyright: (C) 2017 Himanshu Jha |
| 14 | // Comments: |
| 15 | // Options: --no-includes --include-headers |
| 16 | // |
| 17 | |
| 18 | virtual context |
| 19 | virtual patch |
| 20 | virtual org |
| 21 | virtual report |
| 22 | |
| 23 | @m1@ |
| 24 | identifier i; |
| 25 | expression e; |
| 26 | type T; |
| 27 | position p1; |
| 28 | @@ |
| 29 | |
| 30 | #define i (T@p1 *)e |
| 31 | |
| 32 | @m2@ |
| 33 | identifier i; |
| 34 | expression e; |
| 35 | type T; |
| 36 | position p2; |
| 37 | @@ |
| 38 | |
| 39 | #define i(...) (T@p2 *)e |
| 40 | |
| 41 | @initialize:python@ |
| 42 | @@ |
| 43 | import re |
| 44 | pattern = '__' |
| 45 | m = re.compile(pattern) |
| 46 | |
| 47 | @r1 depends on context || patch@ |
| 48 | type T; |
| 49 | position p != {m1.p1,m2.p2}; |
| 50 | @@ |
| 51 | |
| 52 | (T@p *) |
| 53 | \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| |
| 54 | kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| |
| 55 | dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| |
| 56 | kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\| |
| 57 | vmalloc_node\|vzalloc_node\)(...) |
| 58 | |
| 59 | //---------------------------------------------------------- |
| 60 | // For context mode |
| 61 | //---------------------------------------------------------- |
| 62 | |
| 63 | @script:python depends on context@ |
| 64 | t << r1.T; |
| 65 | @@ |
| 66 | |
| 67 | if m.search(t) != None: |
| 68 | cocci.include_match(False) |
| 69 | |
| 70 | @depends on context && r1@ |
| 71 | type r1.T; |
| 72 | @@ |
| 73 | |
| 74 | * (T *) |
| 75 | \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| |
| 76 | kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| |
| 77 | dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| |
| 78 | kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\| |
| 79 | vmalloc_node\|vzalloc_node\)(...) |
| 80 | |
| 81 | //---------------------------------------------------------- |
| 82 | // For patch mode |
| 83 | //---------------------------------------------------------- |
| 84 | |
| 85 | @script:python depends on patch@ |
| 86 | t << r1.T; |
| 87 | @@ |
| 88 | |
| 89 | if m.search(t) != None: |
| 90 | cocci.include_match(False) |
| 91 | |
| 92 | @depends on patch && r1@ |
| 93 | type r1.T; |
| 94 | @@ |
| 95 | |
| 96 | - (T *) |
| 97 | \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| |
| 98 | kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| |
| 99 | dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| |
| 100 | kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\| |
| 101 | vmalloc_node\|vzalloc_node\)(...) |
| 102 | |
| 103 | //---------------------------------------------------------- |
| 104 | // For org and report mode |
| 105 | //---------------------------------------------------------- |
| 106 | |
| 107 | @r2 depends on org || report@ |
| 108 | type T; |
| 109 | position p != {m1.p1,m2.p2}; |
| 110 | @@ |
| 111 | |
| 112 | (T@p *) |
| 113 | \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| |
| 114 | kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| |
| 115 | dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| |
| 116 | kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\| |
| 117 | vmalloc_node\|vzalloc_node\)(...) |
| 118 | |
| 119 | @script:python depends on org@ |
| 120 | p << r2.p; |
| 121 | t << r2.T; |
| 122 | @@ |
| 123 | |
| 124 | if m.search(t) != None: |
| 125 | cocci.include_match(False) |
| 126 | else: |
| 127 | coccilib.org.print_safe_todo(p[0], t) |
| 128 | |
| 129 | @script:python depends on report@ |
| 130 | p << r2.p; |
| 131 | t << r2.T; |
| 132 | @@ |
| 133 | |
| 134 | if m.search(t) != None: |
| 135 | cocci.include_match(False) |
| 136 | else: |
| 137 | msg="WARNING: casting value returned by memory allocation function to (%s *) is useless." % (t) |
| 138 | coccilib.report.print_report(p[0], msg) |