Messages in this thread | | | Date | Sat, 28 Jun 2014 19:55:33 +0200 (CEST) | From | Julia Lawall <> | Subject | Re: [PATCH V3] scripts/coccinelle/free: add NULL test before freeing functions |
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On Sat, 28 Jun 2014, Fabian Frederick wrote:
> Warns or generates patch for NULL check before the following functions: > > kfree > usb_free_urb > debugfs_remove > debugfs_remove_recursive > > Cc: Julia Lawall <Julia.Lawall@lip6.fr> > Cc: Gilles Muller <Gilles.Muller@lip6.fr> > Cc: Joe Perches <joe@perches.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: Julia Lawall <Julia.Lawall@lip6.fr>
> --- > > V3: > -Update print_main message. > -Add patch mode (suggested by Julia Lawall) > > V2: > -Add 3 more functions to kfree (suggested by Joe Perches) > -Update warning message to involve code analysis (suggested by Julia Lawall) > > scripts/coccinelle/free/ifnullfree.cocci | 53 ++++++++++++++++++++++++++++++++ > 1 file changed, 53 insertions(+) > create mode 100644 scripts/coccinelle/free/ifnullfree.cocci > > diff --git a/scripts/coccinelle/free/ifnullfree.cocci b/scripts/coccinelle/free/ifnullfree.cocci > new file mode 100644 > index 0000000..c826d98 > --- /dev/null > +++ b/scripts/coccinelle/free/ifnullfree.cocci > @@ -0,0 +1,53 @@ > +/// NULL check before some freeing functions is not needed. > +/// > +/// Based on checkpatch warning > +/// "kfree(NULL) is safe this check is probably not required" > +/// and kfreeaddr.cocci by Julia Lawall. > +/// > +/// Comments: - > +/// Options: --no-includes --include-headers > + > +virtual patch > +virtual org > +virtual report > +virtual context > + > +@r2 depends on patch@ > +expression E; > +@@ > +- if (E) > +( > +- kfree(E); > ++ kfree(E); > +| > +- debugfs_remove(E); > ++ debugfs_remove(E); > +| > +- debugfs_remove_recursive(E); > ++ debugfs_remove_recursive(E); > +| > +- usb_free_urb(E); > ++ usb_free_urb(E); > +) > + > +@r depends on context || report || org @ > +expression E; > +position p; > +@@ > + > +* if (E) > +* \(kfree@p\|debugfs_remove@p\|debugfs_remove_recursive@p\|usb_free_urb\)(E); > + > +@script:python depends on org@ > +p << r.p; > +@@ > + > +cocci.print_main("NULL check before that freeing function is not needed", p) > + > +@script:python depends on report@ > +p << r.p; > +@@ > + > +msg = "WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values." > +coccilib.report.print_report(p[0], msg) > + > -- > 1.8.4.5 > >
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