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Message-ID: <20190407112238.GA30750@archlinux-ryzen> Date: Sun, 7 Apr 2019 04:22:38 -0700 From: Nathan Chancellor <natechancellor@...il.com> To: Qian Cai <cai@....pw> Cc: gregkh@...uxfoundation.org, rjw@...ysocki.net, lenb@...nel.org, keith.busch@...el.com, linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH -next] acpi/hmat: fix an uninitialized memory_target On Sat, Apr 06, 2019 at 09:12:22PM -0400, Qian Cai wrote: > The commit 665ac7e92757 ("acpi/hmat: Register processor domain to its > memory") introduced an uninitialized "struct memory_target" that could > cause an incorrect branching. > > drivers/acpi/hmat/hmat.c:385:6: warning: variable 'target' is used > uninitialized whenever 'if' condition is false > [-Wsometimes-uninitialized] > if (p->flags & ACPI_HMAT_MEMORY_PD_VALID) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/acpi/hmat/hmat.c:392:6: note: uninitialized use occurs here > if (target && p->flags & ACPI_HMAT_PROCESSOR_PD_VALID) { > ^~~~~~ > drivers/acpi/hmat/hmat.c:385:2: note: remove the 'if' if its condition > is always true > if (p->flags & ACPI_HMAT_MEMORY_PD_VALID) { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/acpi/hmat/hmat.c:369:30: note: initialize the variable 'target' > to silence this warning > struct memory_target *target; > ^ > = NULL > > Signed-off-by: Qian Cai <cai@....pw> Reviewed-by: Nathan Chancellor <natechancellor@...il.com> > --- > drivers/acpi/hmat/hmat.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c > index c9b8abcf012c..6653dba3b377 100644 > --- a/drivers/acpi/hmat/hmat.c > +++ b/drivers/acpi/hmat/hmat.c > @@ -366,7 +366,7 @@ static int __init hmat_parse_proximity_domain(union acpi_subtable_headers *heade > const unsigned long end) > { > struct acpi_hmat_proximity_domain *p = (void *)header; > - struct memory_target *target; > + struct memory_target *target = NULL; > > if (p->header.length != sizeof(*p)) { > pr_notice("HMAT: Unexpected address range header length: %d\n", > -- > 2.17.2 (Apple Git-113) >
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