Re: [syzbot] [PATCH] null pointer dereference

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***

Subject: [PATCH] null pointer dereference
Author: yuran.pereira@xxxxxxxxxxx

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Signed-off-by: Yuran Pereira <yuran.pereira@xxxxxxxxxxx>
---
 drivers/ptp/ptp_chardev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 282cd7d24077..5b36c34629a0 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -173,6 +173,8 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd,
 	int enable, err = 0;
 
 	tsevq = pccontext->private_clkdata;
+	if (!tsevq)
+		return -EINVAL;
 
 	switch (cmd) {
 
-- 
2.25.1