Messages in this thread | | | Date | Thu, 6 Jun 2019 00:00:43 +0800 | From | Gen Zhang <> | Subject | Re: [PATCH] clk: fix a missing-free bug in clk_cpy_name() |
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On Wed, Jun 05, 2019 at 08:38:00AM +0200, Jiri Slaby wrote: > On 31. 05. 19, 3:14, Gen Zhang wrote: > > In clk_cpy_name(), '*dst_p'('parent->name'and 'parent->fw_name') and > > 'dst' are allcoted by kstrdup_const(). According to doc: "Strings > > allocated by kstrdup_const should be freed by kfree_const". So > > 'parent->name', 'parent->fw_name' and 'dst' should be freed. > > > > Signed-off-by: Gen Zhang <blackgod016574@gmail.com> > > --- > > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c > > index aa51756..85c4d3f 100644 > > --- a/drivers/clk/clk.c > > +++ b/drivers/clk/clk.c > > @@ -3435,6 +3435,7 @@ static int clk_cpy_name(const char **dst_p, const char *src, bool must_exist) > > if (!dst) > > return -ENOMEM; > > > > + kfree_const(dst); > > So you are now returning a freed pointer in dst_p? Thanks for your reply. I re-examined the code, and this kfree is incorrect and it should be deleted. > > > return 0; > > } > > > > @@ -3491,6 +3492,8 @@ static int clk_core_populate_parent_map(struct clk_core *core) > > kfree_const(parents[i].name); > > kfree_const(parents[i].fw_name); > > } while (--i >= 0); > > + kfree_const(parent->name); > > + kfree_const(parent->fw_name); > > Both of them were just freed in the loop above, no? for (i = 0, parent = parents; i < num_parents; i++, parent++) Is 'parent' the same as the one from the loop above?
Moreover, should 'parents[i].name' and 'parents[i].fw_name' be freed by kfree_const()?
Thanks Gen > > thanks, > -- > js > suse labs
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