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

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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: c6385c0b67 ("netdevsim: Allow reporting activity on nexthop buckets")
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20241022171907.8606-1-zichenxie0106@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zichen Xie 2024-10-22 12:19:08 -05:00 committed by Jakub Kicinski
parent 2e95c43844
commit 4ce1f56a1e
1 changed files with 3 additions and 1 deletions
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4
drivers/net/netdevsim/fib.c
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@ -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;