linux-kernel - Re: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Fri, 10 May 2024 19:06:13 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Ryosuke Yasuoka <ryasuoka@...hat.com>
Cc: krzk@...nel.org, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, horms@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, syoshida@...hat.com,
 syzbot+d7b4dc6cd50410152534@...kaller.appspotmail.com
Subject: Re: [PATCH net v4] nfc: nci: Fix uninit-value in nci_rx_work

On Thu,  9 May 2024 20:30:33 +0900 Ryosuke Yasuoka wrote:
> -		if (!nci_plen(skb->data)) {
> +		if (!skb->len) {
>  			kfree_skb(skb);
> -			kcov_remote_stop();
> -			break;
> +			continue;

the change from break to continue looks unrelated

>  		}

> -			nci_ntf_packet(ndev, skb);
> +			if (nci_valid_size(skb, NCI_CTRL_HDR_SIZE))

> +			if (nci_valid_size(skb, NCI_DATA_HDR_SIZE))


#define NCI_CTRL_HDR_SIZE                                       3
#define NCI_DATA_HDR_SIZE                                       3

you can add a BUILD_BUG_ON(NCI_CTRL_HDR_SIZE == NCI_DATA_HDR_SIZE)
and save all the code duplication.