diff mbox series

[v2] netdevsim: Add trailing zero to terminate the string in nsim_nexthop_bucket_activity_write()

Message ID 20241022171907.8606-1-zichenxie0106@gmail.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series [v2] netdevsim: Add trailing zero to terminate the string in nsim_nexthop_bucket_activity_write() | expand

Commit Message

Gax-c Oct. 22, 2024, 5:19 p.m. UTC 
From: Zichen Xie <zichenxie0106@gmail.com>

This was found by a static analyzer.
We should not forget the trailing zero after copy_from_user()
if we will further do some string operations, sscanf() in this
case. Adding a trailing zero will ensure that the function
performs properly.

Fixes: c6385c0b67c5 ("netdevsim: Allow reporting activity on nexthop buckets")
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
---
v2: adjust code format.
---
 drivers/net/netdevsim/fib.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index 41e80f78b316..16c382c42227 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -1377,10 +1377,12 @@  static ssize_t nsim_nexthop_bucket_activity_write(struct file *file,
 
 	if (pos != 0)
 		return -EINVAL;
-	if (size > sizeof(buf))
+	if (size > sizeof(buf) - 1)
 		return -EINVAL;
 	if (copy_from_user(buf, user_buf, size))
 		return -EFAULT;
+	buf[size] = 0;
+
 	if (sscanf(buf, "%u %hu", &nhid, &bucket_index) != 2)
 		return -EINVAL;