From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F6204F30C2 for ; Thu, 3 Sep 2026 16:50:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788454233; cv=none; b=RXRzwEly3sCYNO4sypjOsCHjp2wYTuBajol6pqsddtv0B1PQ9tFAkjEk4P76Inr9E5ecxDywCFp7u7LsZgWg0pHCq2P1d5E45kzD6QMB/0uc63yjbOTor5mkzzfEtVxItp3Mn4gnGFhKEP1wAof4OCVVh0XoYrpEgT29+7uUOfU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788454233; c=relaxed/simple; bh=WIYW1hFseBhkom1HpovCX+6HMqEApH6/wtHvd3IL/Cw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=HyIHPko30ELpKS21iGTKhyBeu9sMPslJYTYdT8NbEAjVxplHa3kqh1WJMS/jRMsPZR3pB6sFf1egq1JXpRcQbZeiAtIpDOqG6f3rRSLZ6owgr0Pxrti/iK6DkS70v3BN4pnY4QxcsylcwBWoTNPfVw9QyJTYaqU0i13XVSlJuEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ojvU+YMd; arc=none smtp.client-ip=209.85.221.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ojvU+YMd" Received: by mail-wr1-f51.google.com with SMTP id ffacd0b85a97d-47de0093c42so84267f8f.3 for ; Thu, 03 Sep 2026 09:50:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788454230; x=1789059030; darn=vger.kernel.org; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:from:to:cc:subject:date:message-id:reply-to :content-type; bh=9P1PcfnFpiawXqi46+lwtTgAUutr2k9gbd+NE4dCYww=; b=ojvU+YMdFfVuFj2nIbfVOEwsGgEhz3qwPFA/lOM+gORChQwQkaEEEhcehBAiRfUkQ0 CLwP3HBGAsip2UVnmCmy6VEtPmmQ/RYeEaWZpkiweEriVsma9RpqY+zaDqXh8Zu71LSX U5qhYLlf4vAm2U793ereSdb4AIgaYH3SdQXbTwWCm0SDRAbSPQT8OrXqy2Gf4Z+nQlmj anlcMMHJPm9/KecATx4Wv9jmhPuX2TnF9c3jR4Yin5t9fsNinS3igS8bcG+tXsU/x/f3 RfT5yv4dWBL7ae6hHLaQnxhAM+8159CVwJSnXeXvKcEYzZMIstyP8b8E/P1VxlLKA8I7 tmlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788454230; x=1789059030; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=9P1PcfnFpiawXqi46+lwtTgAUutr2k9gbd+NE4dCYww=; b=CkTmYD8zMIpcFv6EKm2lSPRPMNtOMrA9ccjRM8NqC0okh6XgNikXxwsLpLSg2smFyx GpGVRmqJQ4FHn1afCBxMuZPEBae4eC1V8dLyA1p5KOCzInvq7u+mZNfFVdHAv1fyE4M/ E2h/nV+cGze55+nbYZHOZu/nWCDcRo1/Y6DUJifaqmFp/luoq8SXF+F/2m+zxc5G4vdj X/cFS6GwTxyvEnq0G5/1SL8EHP6+NE3mlmbPmgarLpGKvASmCgsy2yFFLD6yfWXe6DBO tJ92nFA8sxZ+7nd/coSdES847gsm0Ftn2RebIpbWuoGf3p+EtuneWxV7T7d8tgx8u8Wl 2UhA== X-Forwarded-Encrypted: i=1; AKwUvBwJAdcc1golnEy+/5Q7xHaYuMYzKQr6ObX35S8mhds9zVhfcgJdKulBE8zmFZyDVSDuK2E6b5WMwLfV1Cc=@vger.kernel.org X-Gm-Message-State: AFuF++ln0kA/7BwvV8X0OcQ6VF9E1J64yoDeHAAI0e4Ia7olqOy1SPPK wVamfxSEubPswHsxogqgvDWVY2L0DvsxvGIdzDAxRdo/eRgG8kmV5/FG X-Gm-Gg: AYBFou3MACgRx3laD5U2kAZ8dSTa5wPYuawf+GmSgmqh9VZj1D9LSntFu8xS7oYsIzV sjJeBEUzBkZen+1nkef/f50iEeCmNb5245snWtwvuyfBA2SC9jI7KQjK44UX/VR3rcqo9wSW6Oz 3+F5Y6ChU81BHfuZ3Ji6UQHMWDQCNpcDz1WLeUeM4fSjKvP6TJdIP4dltpXq5kxAzNF9+1lcN+M ZJlhvxjePeLZvh780pB3kFE1dfJ8QAURxhHOh6RCnH9CnuNI46lUmsnUzoYoa3fS8NPEMNY8UWw pVBtIYMn6UnPoZv8Dhi0DqurDVzdzJeM0FkfYS6rKxQ2E3Y2Ok8Xw7E72bdTIh1zcFuCJkiKimz N/ZedkRHB7yoFCFO62YCeMAs9Um3Ty1izC/qowWsqijfXUWFSSf8fL10+Iy4gSXOT1IZEWYor72 p6sQAfwIozwbZQuJMD12+49RE7W9sA8jlgfPU2njZtfIvKd8lkLzKfHGf/cg== X-Received: by 2002:a05:6000:46c7:b0:485:847f:fd97 with SMTP id ffacd0b85a97d-485870914ccmr561197f8f.4.1788454229792; Thu, 03 Sep 2026 09:50:29 -0700 (PDT) Received: from metepc ([46.197.185.71]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48448e7fddbsm14470014f8f.11.2026.09.03.09.50.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2026 09:50:29 -0700 (PDT) From: =?UTF-8?q?=C3=96mer=20Mete=20Kaya?= To: netdev@vger.kernel.org Cc: david@ixit.cz, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, oe-linux-nfc@lists.linux.dev, linux-kernel@vger.kernel.org, =?UTF-8?q?=C3=96mer=20Mete=20Kaya?= , syzbot+1e3df0852e82c21ca418@syzkaller.appspotmail.com Subject: [PATCH] nfc: llcp: fix slab-out-of-bounds read in nfc_llcp_wks_sap() Date: Thu, 3 Sep 2026 19:49:39 +0300 Message-ID: <20260903165014.497490-1-omermetekaya0@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit nfc_llcp_wks_sap() passes service_name to pr_debug() using the %s format specifier. The service_name buffer is allocated via kmemdup() in llcp_sock_bind() and is not null-terminated, causing __dynamic_pr_debug() to read beyond the allocated region: KASAN: slab-out-of-bounds Read in __dynamic_pr_debug Fix by using %.*s with service_name_len to limit the output to the actual length of the string. Reported-by: syzbot+1e3df0852e82c21ca418@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=1e3df0852e82c21ca418 Signed-off-by: Ömer Mete Kaya --- net/nfc/llcp_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c index cac1b5487064..fda236e4d9fd 100644 --- a/net/nfc/llcp_core.c +++ b/net/nfc/llcp_core.c @@ -341,7 +341,7 @@ static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len) { int sap, num_wks; - pr_debug("%s\n", service_name); + pr_debug("%.*s\n", (int)service_name_len, service_name); if (service_name == NULL) return -EINVAL; -- 2.55.0