Benjamin Kramer
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054faa5a48
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Sema: Warn on sizeof on binary ops on decayed arrays.
The array will decay into a pointer, creating an unexpected result.
sizeof(array + int) is an easy to make typo for sizeof(array) + int.
This was motivated by a NetBSD security bug, used sizeof(key - r) instead of
sizeof(key) - r, reducing entropy in a random number generator.
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/kern/subr_cprng.c.diff?r1=1.14&r2=1.15&only_with_tag=MAIN&f=h
Differential Revision: http://llvm-reviews.chandlerc.com/D571
llvm-svn: 178371
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2013-03-29 21:43:21 +00:00 |