name : alloc_cast.cocci // 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 @initialize:python@ @@ import re pattern = '__' m = re.compile(pattern) @r1 depends on context || patch@ type T; @@ (T *) \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) //---------------------------------------------------------- // 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 *) \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) //---------------------------------------------------------- // 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 *) \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) //---------------------------------------------------------- // For org and report mode //---------------------------------------------------------- @r2 depends on org || report@ type T; position p; @@ (T@p *) \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\| kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\| dma_alloc_coherent\|devm_kmalloc\|devm_kzalloc\| kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\| pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\| kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...) @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)