From e52320c3b20cbe209e98f2443866209120595636 Mon Sep 17 00:00:00 2001 From: Himangi Saraogi Date: Mon, 14 Jul 2014 23:04:10 +0530 Subject: [PATCH] Coccinelle: Script to detect incorrect argument to sizeof This makes an effort to find cases where the argument to sizeof is wrong in memory allocation functions by checking the type of the allocated memory when it is a double pointer and ensuring the sizeof argument takes a pointer to the the memory being allocated. There are false positives in cases the sizeof argument is not used in constructing the return value. Signed-off-by: Himangi Saraogi Acked-by: Julia Lawall Signed-off-by: Michal Marek --- scripts/coccinelle/misc/badty.cocci | 76 +++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 scripts/coccinelle/misc/badty.cocci diff --git a/scripts/coccinelle/misc/badty.cocci b/scripts/coccinelle/misc/badty.cocci new file mode 100644 index 000000000000..2fc06fc71927 --- /dev/null +++ b/scripts/coccinelle/misc/badty.cocci @@ -0,0 +1,76 @@ +/// Use ARRAY_SIZE instead of dividing sizeof array with sizeof an element +/// +//# This makes an effort to find cases where the argument to sizeof is wrong +//# in memory allocation functions by checking the type of the allocated memory +//# when it is a double pointer and ensuring the sizeof argument takes a pointer +//# to the the memory being allocated. There are false positives in cases the +//# sizeof argument is not used in constructing the return value. The result +//# may need some reformatting. +// +// Confidence: Moderate +// Copyright: (C) 2014 Himangi Saraogi. GPLv2. +// Comments: +// Options: + +virtual patch +virtual context +virtual org +virtual report + +//---------------------------------------------------------- +// For context mode +//---------------------------------------------------------- + +@depends on context disable sizeof_type_expr@ +type T; +T **x; +@@ + + x = + <+...sizeof( +* T + )...+> + +//---------------------------------------------------------- +// For patch mode +//---------------------------------------------------------- + +@depends on patch disable sizeof_type_expr@ +type T; +T **x; +@@ + + x = + <+...sizeof( +- T ++ *x + )...+> + +//---------------------------------------------------------- +// For org and report mode +//---------------------------------------------------------- + +@r disable sizeof_type_expr@ +type T; +T **x; +position p; +@@ + + x = + <+...sizeof( + T@p + )...+> + +@script:python depends on org@ +p << r.p; +@@ + +coccilib.org.print_todo(p[0], "WARNING sizeof argument should be pointer type, not structure type") + +@script:python depends on report@ +p << r.p; +@@ + +msg="WARNING: Use correct pointer type argument for sizeof" +coccilib.report.print_report(p[0], msg) +