Re: [PATCH net v4 1/2] net: sched: act_connmark: initialize struct tc_ife to fix kernel leak
From: Eric Dumazet <edumazet@google.com>
Date: 2025-11-09 09:30:33
Also in:
lkml
On Sun, Nov 9, 2025 at 1:13 AM Ranganath V N [off-list ref] wrote:
In tcf_connmark_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied. Reported-by: syzbot+0c85cae3350b7d486aee@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=0c85cae3350b7d486aee Tested-by: syzbot+0c85cae3350b7d486aee@syzkaller.appspotmail.com Fixes: 22a5dc0e5e3e ("net: sched: Introduce connmark action") Signed-off-by: Ranganath V N <redacted> ---
Reviewed-by: Eric Dumazet <edumazet@google.com>