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6dd9379e8f
Since commit 3ef0e5ba46 ('slab: introduce kzfree()'),
kfree() is no more the only function to be considered:
kzfree() should be recognized too.
In particular, kzfree() must not be called on memory
allocated through devm_*() functions.
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
60 lines
1.3 KiB
Plaintext
60 lines
1.3 KiB
Plaintext
/// NULL check before some freeing functions is not needed.
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///
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/// Based on checkpatch warning
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/// "kfree(NULL) is safe this check is probably not required"
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/// and kfreeaddr.cocci by Julia Lawall.
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///
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// Copyright: (C) 2014 Fabian Frederick. GPLv2.
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// Comments: -
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// Options: --no-includes --include-headers
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virtual patch
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virtual org
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virtual report
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virtual context
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@r2 depends on patch@
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expression E;
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@@
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- if (E != NULL)
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(
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kfree(E);
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kzfree(E);
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debugfs_remove(E);
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debugfs_remove_recursive(E);
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usb_free_urb(E);
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kmem_cache_destroy(E);
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mempool_destroy(E);
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dma_pool_destroy(E);
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)
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@r depends on context || report || org @
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expression E;
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position p;
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@@
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* if (E != NULL)
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* \(kfree@p\|kzfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\|
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* usb_free_urb@p\|kmem_cache_destroy@p\|mempool_destroy@p\|
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* dma_pool_destroy@p\)(E);
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@script:python depends on org@
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p << r.p;
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@@
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cocci.print_main("NULL check before that freeing function is not needed", p)
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@script:python depends on report@
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p << r.p;
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@@
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msg = "WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values."
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coccilib.report.print_report(p[0], msg)
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