Check that alloc and free types of functions match each other. Signed-off-by: Denis Efremov <efre...@linux.com> --- Changes in v2: - Lines are limited to 80 characters where possible - Confidence changed from High to Medium because of fs/btrfs/send.c:1119 false-positive - __vmalloc_area_node() explicitly excluded from analysis instead of !(file in "mm/vmalloc.c") condition Changes in v3: - prints style in org && report modes changed for python2 Changes in v4: - missing msg argument to print_todo fixed
scripts/coccinelle/api/kvfree.cocci | 227 ++++++++++++++++++++++++++++ 1 file changed, 227 insertions(+) create mode 100644 scripts/coccinelle/api/kvfree.cocci diff --git a/scripts/coccinelle/api/kvfree.cocci b/scripts/coccinelle/api/kvfree.cocci new file mode 100644 index 000000000000..d73578c5549c --- /dev/null +++ b/scripts/coccinelle/api/kvfree.cocci @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0-only +/// +/// Check that kvmalloc'ed memory is freed by kfree functions, +/// vmalloc'ed by vfree functions and kvmalloc'ed by kvfree +/// functions. +/// +// Confidence: Medium +// Copyright: (C) 2020 Denis Efremov ISPRAS +// Options: --no-includes --include-headers +// + +virtual patch +virtual report +virtual org +virtual context + +@initialize:python@ +@@ +# low-level memory api +filter = frozenset(['__vmalloc_area_node']) + +def relevant(p): + return not (filter & {el.current_element for el in p}) + +@choice@ +expression E, E1; +position kok, vok; +@@ + +( + if (...) { + ... + E = \(kmalloc@kok\|kzalloc@kok\|krealloc@kok\|kcalloc@kok\| + kmalloc_node@kok\|kzalloc_node@kok\|kmalloc_array@kok\| + kmalloc_array_node@kok\|kcalloc_node@kok\)(...) + ... + } else { + ... + E = \(vmalloc@vok\|vzalloc@vok\|vmalloc_user@vok\|vmalloc_node@vok\| + vzalloc_node@vok\|vmalloc_exec@vok\|vmalloc_32@vok\| + vmalloc_32_user@vok\|__vmalloc@vok\|__vmalloc_node_range@vok\| + __vmalloc_node@vok\)(...) + ... + } +| + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\|kzalloc_node\| + kmalloc_array\|kmalloc_array_node\|kcalloc_node\)(...) + ... when != E = E1 + when any + if (\(!E\|E == NULL\)) { + ... + E = \(vmalloc@vok\|vzalloc@vok\|vmalloc_user@vok\|vmalloc_node@vok\| + vzalloc_node@vok\|vmalloc_exec@vok\|vmalloc_32@vok\| + vmalloc_32_user@vok\|__vmalloc@vok\|__vmalloc_node_range@vok\| + __vmalloc_node@vok\)(...) + ... + } +) + +@opportunity depends on !patch@ +expression E, E1, size; +position p : script:python() { relevant(p) }; +@@ + +( +* if (\(size <= E1\|size < E1\|size = E1\|size > E1\) || ...)@p { + ... + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\|kzalloc_node\| + kmalloc_array\|kmalloc_array_node\|kcalloc_node\)(..., size, ...) + ... + } else { + ... + E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\| + vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\| + __vmalloc_node_range\|__vmalloc_node\)(..., size, ...) + ... + } +| + E = \(kmalloc\|kzalloc\|krealloc\|kcalloc\|kmalloc_node\|kzalloc_node\| + kmalloc_array\|kmalloc_array_node\|kcalloc_node\)(..., size, ...) + ... when != E = E1 + when != size = E1 + when any +* if (\(!E\|E == NULL\))@p { + ... + E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\| + vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\| + __vmalloc_node_range\|__vmalloc_node\)(..., size, ...) + ... + } +) + +@vfree depends on !patch@ +expression E; +position k != choice.kok; +position p; +@@ + +* E = \(kmalloc@k\|kzalloc@k\|krealloc@k\|kcalloc@k\|kmalloc_node@k\| + kzalloc_node@k\|kmalloc_array@k\|kmalloc_array_node@k\| + kcalloc_node@k\)(...) + ... when != if (...) { ... E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\|vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\|__vmalloc_node\)(...); ... } + when != is_vmalloc_addr(E) + when any +* \(vfree\|vfree_atomic\|kvfree\)(E)@p + +@pvfree depends on patch exists@ +expression E; +position k != choice.kok; +@@ + + E = \(kmalloc@k\|kzalloc@k\|krealloc@k\|kcalloc@k\|kmalloc_node@k\| + kzalloc_node@k\|kmalloc_array@k\|kmalloc_array_node@k\| + kcalloc_node@k\)(...) + ... when != if (...) { ... E = \(vmalloc\|vzalloc\|vmalloc_user\|vmalloc_node\|vzalloc_node\|vmalloc_exec\|vmalloc_32\|vmalloc_32_user\|__vmalloc\|__vmalloc_node_range\|__vmalloc_node\)(...); ... } + when != is_vmalloc_addr(E) + when any +- \(vfree\|vfree_atomic\|kvfree\)(E) ++ kfree(E) + +@kfree depends on !patch@ +expression E; +position v != choice.vok; +position p; +@@ + +* E = \(vmalloc@v\|vzalloc@v\|vmalloc_user@v\|vmalloc_node@v\|vzalloc_node@v\| + vmalloc_exec@v\|vmalloc_32@v\|vmalloc_32_user@v\|__vmalloc@v\| + __vmalloc_node_range@v\|__vmalloc_node@v\)(...) + ... when != !is_vmalloc_addr(E) + when any +* \(kfree\|kzfree\|kvfree\)(E) + +@pkfree depends on patch exists@ +expression E; +position v != choice.vok; +@@ + + E = \(vmalloc@v\|vzalloc@v\|vmalloc_user@v\|vmalloc_node@v\|vzalloc_node@v\| + vmalloc_exec@v\|vmalloc_32@v\|vmalloc_32_user@v\|__vmalloc@v\| + __vmalloc_node_range@v\|__vmalloc_node@v\)(...) + ... when != !is_vmalloc_addr(E) + when any +- \(kfree\|kvfree\)(E) ++ vfree(E) + +@kvfree depends on !patch@ +expression E; +position p, k; +@@ + +* E = \(kvmalloc\|kvzalloc\|kvcalloc\|kvzalloc_node\|kvmalloc_node\| + kvmalloc_array\)(...)@k + ... when != is_vmalloc_addr(E) + when any +* \(kfree\|kzfree\|vfree\|vfree_atomic\)(E)@p + +@pkvfree depends on patch exists@ +expression E; +@@ + + E = \(kvmalloc\|kvzalloc\|kvcalloc\|kvzalloc_node\|kvmalloc_node\| + kvmalloc_array\)(...) + ... when != is_vmalloc_addr(E) + when any +- \(kfree\|vfree\)(E) ++ kvfree(E) + +@script: python depends on report@ +k << vfree.k; +p << vfree.p; +@@ + +msg = "WARNING: kmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +k << vfree.k; +p << vfree.p; +@@ + +msg = "WARNING: kmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.org.print_todo(p[0], msg) + +@script: python depends on report@ +v << kfree.v; +p << kfree.p; +@@ + +msg = "WARNING: vmalloc is used to allocate this memory at line %s" % (v[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +v << kfree.v; +p << kfree.p; +@@ + +msg = "WARNING: vmalloc is used to allocate this memory at line %s" % (v[0].line) +coccilib.org.print_todo(p[0], msg) + +@script: python depends on report@ +k << kvfree.k; +p << kvfree.p; +@@ + +msg = "WARNING: kvmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.report.print_report(p[0], msg) + +@script: python depends on org@ +k << kvfree.k; +p << kvfree.p; +@@ + +msg = "WARNING: kvmalloc is used to allocate this memory at line %s" % (k[0].line) +coccilib.org.print_todo(p[0], msg) + +@script: python depends on report@ +p << opportunity.p; +@@ + +coccilib.report.print_report(p[0], "WARNING: opportunity for kvmalloc") + +@script: python depends on org@ +p << opportunity.p; +@@ + +coccilib.org.print_todo(p[0], "WARNING: opportunity for kvmalloc") -- 2.26.2 _______________________________________________ Cocci mailing list Cocci@systeme.lip6.fr https://systeme.lip6.fr/mailman/listinfo/cocci