5.15-stable review patch. If anyone has any objections, please let me know.
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From: Zichen Xie zichenxie0106@gmail.com
[ 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: c6385c0b67c5 ("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 --- drivers/net/netdevsim/fib.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c index 14787d17f703f..b71414b3a1d40 100644 --- a/drivers/net/netdevsim/fib.c +++ b/drivers/net/netdevsim/fib.c @@ -1366,10 +1366,12 @@ 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;