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