gve: Implement settime64 with -EOPNOTSUPP

ptp_clock_settime() assumes every ptp_clock has implemented settime64().
Stub it with -EOPNOTSUPP to prevent a NULL dereference.

Fixes: acd16380523b ("gve: Add initial PTP device support")
Reported-by: syzbot+a546141ca6d53b90aba3@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=a546141ca6d53b90aba3
Signed-off-by: Tim Hostetler <thostet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Joshua Washington <joshwash@google.com>
Link: https://patch.msgid.link/20251029184555.3852952-3-joshwash@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/google/gve/gve_ptp.c b/drivers/net/ethernet/google/gve/gve_ptp.c
index 19ae699d4b18d7137a68b163deff2a75ce91d429..a384a9ed4914ef02d420617d6eb3fc3ad7b62ec7 100644 (file)
--- a/drivers/net/ethernet/google/gve/gve_ptp.c
+++ b/drivers/net/ethernet/google/gve/gve_ptp.c
@@ -33,6 +33,12 @@ static int gve_ptp_gettimex64(struct ptp_clock_info *info,
        return -EOPNOTSUPP;
 }
 
+static int gve_ptp_settime64(struct ptp_clock_info *info,
+                            const struct timespec64 *ts)
+{
+       return -EOPNOTSUPP;
+}
+
 static long gve_ptp_do_aux_work(struct ptp_clock_info *info)
 {
        const struct gve_ptp *ptp = container_of(info, struct gve_ptp, info);
@@ -55,6 +61,7 @@ static const struct ptp_clock_info gve_ptp_caps = {
        .owner          = THIS_MODULE,
        .name           = "gve clock",
        .gettimex64     = gve_ptp_gettimex64,
+       .settime64      = gve_ptp_settime64,
        .do_aux_work    = gve_ptp_do_aux_work,
 };