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 <j...@perches.com>
---
scripts/checkpatch.pl | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index b28cc38..7ef2b4b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3476,6 +3476,13 @@ sub process {
"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" . $herecurr);
+ }
+
# check for alloc argument mismatch
if ($line =~ /\b(kcalloc|kmalloc_array)\s*\(\s*sizeof\b/) {
WARN("ALLOC_ARRAY_ARGS",
--
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