1/// Remove casting the values returned by memory allocation functions 2/// like kmalloc, kzalloc, kmem_cache_alloc, kmem_cache_zalloc etc. 3/// 4//# This makes an effort to find cases of casting of values returned by 5//# kmalloc, kzalloc, kcalloc, kmem_cache_alloc, kmem_cache_zalloc, 6//# kmem_cache_alloc_node, kmalloc_node and kzalloc_node and removes 7//# the casting as it is not required. The result in the patch case may 8//# need some reformatting. 9// 10// Confidence: High 11// Copyright: (C) 2014 Himangi Saraogi GPLv2. 12// Copyright: (C) 2017 Himanshu Jha GPLv2. 13// Comments: 14// Options: --no-includes --include-headers 15// 16 17virtual context 18virtual patch 19virtual org 20virtual report 21 22@initialize:python@ 23@@ 24import re 25pattern = '__' 26m = re.compile(pattern) 27 28@r1 depends on context || patch@ 29type T; 30@@ 31 32 (T *) 33 \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| 34 kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| 35 dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\| 36 kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| 37 pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| 38 kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) 39 40//---------------------------------------------------------- 41// For context mode 42//---------------------------------------------------------- 43 44@script:python depends on context@ 45t << r1.T; 46@@ 47 48if m.search(t) != None: 49 cocci.include_match(False) 50 51@depends on context && r1@ 52type r1.T; 53@@ 54 55* (T *) 56 \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| 57 kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| 58 dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\| 59 kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| 60 pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| 61 kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) 62 63//---------------------------------------------------------- 64// For patch mode 65//---------------------------------------------------------- 66 67@script:python depends on patch@ 68t << r1.T; 69@@ 70 71if m.search(t) != None: 72 cocci.include_match(False) 73 74@depends on patch && r1@ 75type r1.T; 76@@ 77 78- (T *) 79 \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| 80 kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| 81 dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\| 82 kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| 83 pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| 84 kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) 85 86//---------------------------------------------------------- 87// For org and report mode 88//---------------------------------------------------------- 89 90@r2 depends on org || report@ 91type T; 92position p; 93@@ 94 95 (T@p *) 96 \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| 97 kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| 98 dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\| 99 kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| 100 pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| 101 kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) 102 103@script:python depends on org@ 104p << r2.p; 105t << r2.T; 106@@ 107 108if m.search(t) != None: 109 cocci.include_match(False) 110else: 111 coccilib.org.print_safe_todo(p[0], t) 112 113@script:python depends on report@ 114p << r2.p; 115t << r2.T; 116@@ 117 118if m.search(t) != None: 119 cocci.include_match(False) 120else: 121 msg="WARNING: casting value returned by memory allocation function to (%s *) is useless." % (t) 122 coccilib.report.print_report(p[0], msg) 123