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

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BugLink: https://bugs.launchpad.net/bugs/2099996

[ Upstream commit 4ce1f56a1eaced2523329bef800d004e30f2f76c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2024-50259
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Zichen Xie
2025-02-25 22:59:22 +09:00
committed by Stefan Bader
parent 5d6373b5c0
commit 903e279519
1 changed files with 3 additions and 1 deletions
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drivers/net/netdevsim/fib.c
+3 -1
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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;