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checkpatch: add check for reuse of krealloc arg 

On Thu, 2013-03-14 at 13:30 +0000, David Woodhouse wrote:
> If krealloc() returns NULL, it *doesn't* free the original. So any code
> of the form 'foo = krealloc(foo, …);' is almost certainly a bug.

So add a check for it to checkpatch.

Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2013-04-29 16:18:12 -07:00 committed by Linus Torvalds
parent 2e0fb404c8
commit 972fdea2e6
1 changed files with 7 additions and 0 deletions
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7
scripts/checkpatch.pl
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@ -3477,6 +3477,13 @@ sub process {
"unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr); "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
} }
# check for krealloc arg reuse
if ($^V && $^V ge 5.10.0 &&
$line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) {
WARN("KREALLOC_ARG_REUSE",
"Reusing the krealloc arg is almost always a bug\n" . $herecurr);
}
# check for alloc argument mismatch # check for alloc argument mismatch
if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) { if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
WARN("ALLOC_ARRAY_ARGS", WARN("ALLOC_ARRAY_ARGS",