| // SPDX-License-Identifier: GPL-2.0-only |
| /// Find uses of standard freeing functons on values allocated using devm_ |
| /// functions. Values allocated using the devm_functions are freed when |
| /// the device is detached, and thus the use of the standard freeing |
| /// function would cause a double free. |
| /// See Documentation/driver-api/driver-model/devres.rst for more information. |
| /// |
| /// A difficulty of detecting this problem is that the standard freeing |
| /// function might be called from a different function than the one |
| /// containing the allocation function. It is thus necessary to make the |
| /// connection between the allocation function and the freeing function. |
| /// Here this is done using the specific argument text, which is prone to |
| /// false positives. There is no rule for the request_region and |
| /// request_mem_region variants because this heuristic seems to be a bit |
| /// less reliable in these cases. |
| /// |
| // Confidence: Moderate |
| // Copyright: (C) 2011 Julia Lawall, INRIA/LIP6. |
| // Copyright: (C) 2011 Gilles Muller, INRIA/LiP6. |
| // URL: http://coccinelle.lip6.fr/ |
| // Comments: |
| // Options: --no-includes --include-headers |
| |
| virtual org |
| virtual report |
| virtual context |
| |
| @r depends on context || org || report@ |
| expression x; |
| @@ |
| |
| ( |
| x = devm_kmalloc(...) |
| | |
| x = devm_kvasprintf(...) |
| | |
| x = devm_kasprintf(...) |
| | |
| x = devm_kzalloc(...) |
| | |
| x = devm_kmalloc_array(...) |
| | |
| x = devm_kcalloc(...) |
| | |
| x = devm_kstrdup(...) |
| | |
| x = devm_kmemdup(...) |
| | |
| x = devm_get_free_pages(...) |
| | |
| x = devm_request_irq(...) |
| | |
| x = devm_ioremap(...) |
| | |
| x = devm_ioport_map(...) |
| ) |
| |
| @safe depends on context || org || report exists@ |
| expression x; |
| position p; |
| @@ |
| |
| ( |
| x = kmalloc(...) |
| | |
| x = kvasprintf(...) |
| | |
| x = kasprintf(...) |
| | |
| x = kzalloc(...) |
| | |
| x = kmalloc_array(...) |
| | |
| x = kcalloc(...) |
| | |
| x = kstrdup(...) |
| | |
| x = kmemdup(...) |
| | |
| x = get_free_pages(...) |
| | |
| x = request_irq(...) |
| | |
| x = ioremap(...) |
| | |
| x = ioport_map(...) |
| ) |
| ... |
| ( |
| kfree@p(x) |
| | |
| kzfree@p(x) |
| | |
| krealloc@p(x, ...) |
| | |
| free_pages@p(x, ...) |
| | |
| free_page@p(x) |
| | |
| free_irq@p(x) |
| | |
| iounmap@p(x) |
| | |
| ioport_unmap@p(x) |
| ) |
| |
| @pb@ |
| expression r.x; |
| position p != safe.p; |
| @@ |
| |
| ( |
| * kfree@p(x) |
| | |
| * kzfree@p(x) |
| | |
| * krealloc@p(x, ...) |
| | |
| * free_pages@p(x, ...) |
| | |
| * free_page@p(x) |
| | |
| * free_irq@p(x) |
| | |
| * iounmap@p(x) |
| | |
| * ioport_unmap@p(x) |
| ) |
| |
| @script:python depends on org@ |
| p << pb.p; |
| @@ |
| |
| msg="WARNING: invalid free of devm_ allocated data" |
| coccilib.org.print_todo(p[0], msg) |
| |
| @script:python depends on report@ |
| p << pb.p; |
| @@ |
| |
| msg="WARNING: invalid free of devm_ allocated data" |
| coccilib.report.print_report(p[0], msg) |
| |
