linux-kernel - [PATCH] ptp: ptp_clockmatrix: initialize variables

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Date:   Sun, 11 Oct 2020 13:09:55 -0700
From:   trix@...hat.com
To:     richardcochran@...il.com, natechancellor@...il.com,
        ndesaulniers@...gle.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com, Tom Rix <trix@...hat.com>
Subject: [PATCH] ptp: ptp_clockmatrix: initialize variables

From: Tom Rix <trix@...hat.com>

Clang static analysis reports this representative problem

ptp_clockmatrix.c:1852:2: warning: 5th function call argument
  is an uninitialized value
        snprintf(idtcm->version, sizeof(idtcm->version), "%u.%u.%u",
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

idtcm_display_version_info() calls several idtcm_read_*'s without
checking a return status.  Initialize the read variables so if a
read fails, a garbage value is not displayed.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/ptp/ptp_clockmatrix.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index e020faff7da5..47e5e62da5d2 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -1832,12 +1832,12 @@ static int idtcm_enable_tod(struct idtcm_channel *channel)
 
 static void idtcm_display_version_info(struct idtcm *idtcm)
 {
-	u8 major;
-	u8 minor;
-	u8 hotfix;
-	u16 product_id;
-	u8 hw_rev_id;
-	u8 config_select;
+	u8 major = 0;
+	u8 minor = 0;
+	u8 hotfix = 0;
+	u16 product_id = 0;
+	u8 hw_rev_id = 0;
+	u8 config_select = 0;
 	char *fmt = "%d.%d.%d, Id: 0x%04x  HW Rev: %d  OTP Config Select: %d\n";
 
 	idtcm_read_major_release(idtcm, &major);
-- 
2.18.1