mirror of https://gitee.com/openkylin/linux.git
96 lines
1.6 KiB
Plaintext
96 lines
1.6 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0-only
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/// Many iterators have the property that the first argument is always bound
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/// to a real list element, never NULL.
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//# False positives arise for some iterators that do not have this property,
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//# or in cases when the loop cursor is reassigned. The latter should only
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//# happen when the matched code is on the way to a loop exit (break, goto,
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//# or return).
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///
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// Confidence: Moderate
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// Copyright: (C) 2010-2012 Nicolas Palix.
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// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
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// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
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// URL: http://coccinelle.lip6.fr/
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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 context
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virtual org
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virtual report
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@depends on patch@
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iterator I;
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expression x,E,E1,E2;
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statement S,S1,S2;
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@@
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I(x,...) { <...
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(
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- if (x == NULL && ...) S
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- if (x != NULL || ...)
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S
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- (x == NULL) ||
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E
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- (x != NULL) &&
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E
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- (x == NULL && ...) ? E1 :
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E2
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- (x != NULL || ...) ?
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E1
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- : E2
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- if (x == NULL && ...) S1 else
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S2
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- if (x != NULL || ...)
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S1
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- else S2
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+ BAD(
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x == NULL
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+ )
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+ BAD(
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x != NULL
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+ )
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)
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...> }
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@r depends on !patch exists@
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iterator I;
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expression x,E;
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position p1,p2;
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@@
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*I@p1(x,...)
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{ ... when != x = E
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(
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* x@p2 == NULL
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* x@p2 != NULL
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)
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... when any
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}
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@script:python depends on org@
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p1 << r.p1;
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p2 << r.p2;
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@@
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cocci.print_main("iterator-bound variable",p1)
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cocci.print_secs("useless NULL test",p2)
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@script:python depends on report@
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p1 << r.p1;
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p2 << r.p2;
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@@
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msg = "ERROR: iterator variable bound on line %s cannot be NULL" % (p1[0].line)
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coccilib.report.print_report(p2[0], msg)
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