From mboxrd@z Thu Jan 1 00:00:00 1970 From: Qian Cai Subject: [PATCH -next] acpi/hmat: fix an uninitialized memory_target Date: Sat, 6 Apr 2019 21:12:22 -0400 Message-ID: <20190407011222.38963-1-cai@lca.pw> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: gregkh@linuxfoundation.org Cc: rjw@rjwysocki.net, lenb@kernel.org, keith.busch@intel.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Qian Cai List-Id: linux-acpi@vger.kernel.org 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 --- 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)