New subject: [PATCH AUTOSEL 6.13 2/7] memory: omap-gpmc: drop no compatible check

25 Mar 2025

From: Oliver Hartkopp socketcan@hartkopp.net
[ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ]
In can_send() and can_receive() CAN messages and CAN filter matches are
counted to be visible in the CAN procfs files.
KCSAN detected a data race within can_send() when two CAN frames have
been generated by a timer event writing to the same CAN netdevice at the
same time. Use atomic operations to access the statistics in the hot path
to fix the KCSAN complaint.
Reported-by: syzbot+78ce4489b812515d5e4d@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com
Signed-off-by: Oliver Hartkopp socketcan@hartkopp.net
Reviewed-by: Vincent Mailhol mailhol.vincent@wanadoo.fr
Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de
Signed-off-by: Sasha Levin sashal@kernel.org
---
 net/can/af_can.c | 12 ++++++------
 net/can/af_can.h | 12 ++++++------
 net/can/proc.c   | 46 +++++++++++++++++++++++++++-------------------
 3 files changed, 39 insertions(+), 31 deletions(-)

diff --git a/net/can/af_can.c b/net/can/af_can.c
index 01f3fbb3b67dc..65230e81fa08c 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -287,8 +287,8 @@ int can_send(struct sk_buff *skb, int loop)
    	netif_rx(newskb);
/* update statistics */
-	pkg_stats->tx_frames++;
-	pkg_stats->tx_frames_delta++;
+	atomic_long_inc(&pkg_stats->tx_frames);
+	atomic_long_inc(&pkg_stats->tx_frames_delta);
return 0;
@@ -647,8 +647,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
    int matches;
/* update statistics */
-	pkg_stats->rx_frames++;
-	pkg_stats->rx_frames_delta++;
+	atomic_long_inc(&pkg_stats->rx_frames);
+	atomic_long_inc(&pkg_stats->rx_frames_delta);
/* create non-zero unique skb identifier together with *skb */
    while (!(can_skb_prv(skb)->skbcnt))
@@ -669,8 +669,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
    consume_skb(skb);
if (matches > 0) {
-		pkg_stats->matches++;
-		pkg_stats->matches_delta++;
+		atomic_long_inc(&pkg_stats->matches);
+		atomic_long_inc(&pkg_stats->matches_delta);
    }
 }
diff --git a/net/can/af_can.h b/net/can/af_can.h
index 7c2d9161e2245..22f3352c77fec 100644
--- a/net/can/af_can.h
+++ b/net/can/af_can.h
@@ -66,9 +66,9 @@ struct receiver {
 struct can_pkg_stats {
    unsigned long jiffies_init;
-	unsigned long rx_frames;
-	unsigned long tx_frames;
-	unsigned long matches;
+	atomic_long_t rx_frames;
+	atomic_long_t tx_frames;
+	atomic_long_t matches;
unsigned long total_rx_rate;
    unsigned long total_tx_rate;
@@ -82,9 +82,9 @@ struct can_pkg_stats {
    unsigned long max_tx_rate;
    unsigned long max_rx_match_ratio;
-	unsigned long rx_frames_delta;
-	unsigned long tx_frames_delta;
-	unsigned long matches_delta;
+	atomic_long_t rx_frames_delta;
+	atomic_long_t tx_frames_delta;
+	atomic_long_t matches_delta;
 };
/* persistent statistics */
diff --git a/net/can/proc.c b/net/can/proc.c
index bbce97825f13f..25fdf060e30d0 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t)
    struct can_pkg_stats *pkg_stats = net->can.pkg_stats;
    unsigned long j = jiffies; /* snapshot */
+	long rx_frames = atomic_long_read(&pkg_stats->rx_frames);
+	long tx_frames = atomic_long_read(&pkg_stats->tx_frames);
+	long matches = atomic_long_read(&pkg_stats->matches);
+	long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta);
+	long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta);
+	long matches_delta = atomic_long_read(&pkg_stats->matches_delta);
+
    /* restart counting in timer context on user request */
    if (user_reset)
    	can_init_stats(net);
@@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t)
    	can_init_stats(net);
/* prevent overflow in calc_rate() */
-	if (pkg_stats->rx_frames > (ULONG_MAX / HZ))
+	if (rx_frames > (LONG_MAX / HZ))
    	can_init_stats(net);
/* prevent overflow in calc_rate() */
-	if (pkg_stats->tx_frames > (ULONG_MAX / HZ))
+	if (tx_frames > (LONG_MAX / HZ))
    	can_init_stats(net);
/* matches overflow - very improbable */
-	if (pkg_stats->matches > (ULONG_MAX / 100))
+	if (matches > (LONG_MAX / 100))
    	can_init_stats(net);
/* calc total values */
-	if (pkg_stats->rx_frames)
-		pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) /
-			pkg_stats->rx_frames;
+	if (rx_frames)
+		pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames;
pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j,
-					    pkg_stats->tx_frames);
+					    tx_frames);
    pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j,
-					    pkg_stats->rx_frames);
+					    rx_frames);
/* calc current values */
-	if (pkg_stats->rx_frames_delta)
+	if (rx_frames_delta)
    	pkg_stats->current_rx_match_ratio =
-			(pkg_stats->matches_delta * 100) /
-			pkg_stats->rx_frames_delta;
+			(matches_delta * 100) /	rx_frames_delta;
-	pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta);
-	pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta);
+	pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta);
+	pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta);
/* check / update maximum values */
    if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate)
@@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t)
    	pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio;
/* clear values for 'current rate' calculation */
-	pkg_stats->tx_frames_delta = 0;
-	pkg_stats->rx_frames_delta = 0;
-	pkg_stats->matches_delta   = 0;
+	atomic_long_set(&pkg_stats->tx_frames_delta, 0);
+	atomic_long_set(&pkg_stats->rx_frames_delta, 0);
+	atomic_long_set(&pkg_stats->matches_delta, 0);
/* restart timer (one second) */
    mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ));
@@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v)
    struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats;
seq_putc(m, '\n');
-	seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames);
-	seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames);
-	seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches);
+	seq_printf(m, " %8ld transmitted frames (TXF)\n",
+		   atomic_long_read(&pkg_stats->tx_frames));
+	seq_printf(m, " %8ld received frames (RXF)\n",
+		   atomic_long_read(&pkg_stats->rx_frames));
+	seq_printf(m, " %8ld matched frames (RXMF)\n",
+		   atomic_long_read(&pkg_stats->matches));
seq_putc(m, '\n');
-- 
2.39.5



    

[PATCH AUTOSEL 6.13 1/7] can: statistics: use atomic access in hot path