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67 lines
1.0 KiB
67 lines
1.0 KiB
10 months ago
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// find cases where a pointer is dereferenced and then compared to NULL
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//
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// Confidence: High
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// Copyright: (C) Gilles Muller, Julia Lawall, EMN, INRIA, DIKU. GPLv2.
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// URL: https://coccinelle.gitlabpages.inria.fr/website/rules/null_ref.html
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// Options:
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@match exists@
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expression x, E,E1;
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identifier fld;
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position p1,p2;
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@@
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(
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x = E;
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... when != \(x = E1\|&x\)
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x@p2 == NULL
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... when any
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x = E
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... when != \(x = E1\|&x\)
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x@p2 == NULL
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... when any
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x != NULL && (<+...x->fld...+>)
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x == NULL || (<+...x->fld...+>)
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x != NULL ? (<+...x->fld...+>) : E
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x@p1->fld
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... when != \(x = E\|&x\)
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x@p2 == NULL
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... when any
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)
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@other_match exists@
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expression match.x, E1, E2;
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position match.p1,match.p2;
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@@
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(
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x = E1
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x
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)
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... when != \(x = E2\|&x\)
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when != x@p1
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x@p2
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@other_match1 exists@
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expression match.x, E2;
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position match.p1,match.p2;
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@@
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... when != \(x = E2\|&x\)
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when != x@p1
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x@p2
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@ script:python depends on !other_match && !other_match1@
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p1 << match.p1;
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p2 << match.p2;
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@@
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cocci.print_main("",p1)
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cocci.print_sec("NULL test",p2)
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