From nobody Thu Apr 2 23:53:18 2026 Received: from mail-pl1-f179.google.com (mail-pl1-f179.google.com [209.85.214.179]) (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 0B67123EAAB for ; Sun, 15 Feb 2026 07:10:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771139411; cv=none; b=pBGxZMMMB+U2OZctPyitIpm5BkMa3KjxWxO50qiVn/G7pEkl5lfXpzCp7pJm1jPIP7P8yrSY+Q+COqJmiVmMRixbVPqKKW3scX2IIwl65CQuc2RJ8Q7yhm2LkHqd+W8y6ET5AAs1fBFiZjcE9ZFW3blAGDGFTpcMTLWZk58RKVg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771139411; c=relaxed/simple; bh=48kQZ2ApYlekyRt0BAif+sMeREloJXMXGLg7PghooTU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Q1Ql20ITAH89Eh4NSeLARzlYjlNzzPkHFmSfA4U7qCn2QRaX46sQ1uaEjKmooPPmoTpW2lt04hoADOzZEtm6Lg5WR5qYM7RllO0J9pV923AdQaaRouW2ynNtwdYvSKvwlyFysi1ufiJC1zsKdPv+QA7Q1o1p2QLoGwDI7CDb91M= 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=KRHWKqIA; arc=none smtp.client-ip=209.85.214.179 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="KRHWKqIA" Received: by mail-pl1-f179.google.com with SMTP id d9443c01a7336-2a7bced39cfso25437025ad.1 for ; Sat, 14 Feb 2026 23:10:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1771139409; x=1771744209; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=oiLAHDVjSxKvSNOVbOnL+dTEI9S7sddzZ4pZsSNgz2s=; b=KRHWKqIA+Hwig0I2wXjTU+5im9uiaI6UvWHqlorLRby60XvL9xeecMbX0rGZVYE2hB ZHEcSSiRWfVVf8TLkZP6hXvZCoJh31ufNfiWbOIvPDWUGCzOhlLO7Y/QY+TIwObn5qMX 3bjGH+o7SkqovpUQJq1ZPrih3DTe8Bn59uz5I+TDVaBibDUJXxOZRI9yaYk6Tnftj7MM eELB4Or1lz4gn+oF5k0s6YomvsNEI9ZWo6y/YKQygCl8pRHvUJiWmOr6kJNbPqg01+rS 0jNbR5CvE5byP3UrsR6gST/mnlXl4+R9HDZ94NgySffWmOsXJxri8BqfyBhT0bSrR89X zArw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771139409; x=1771744209; h=content-transfer-encoding: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; bh=oiLAHDVjSxKvSNOVbOnL+dTEI9S7sddzZ4pZsSNgz2s=; b=ZEF1F3ioS/72w0X4KoyNjFPNWooDTHRfC2nbiRXBLAPLxMfEP5tHqm+ZD9YuWTu6i0 TkRoKqx9yVzXd4wDV3WGvcJ04wA2EbMqgk1WlidUpAJ1Ftl97sZrmV0JZQLbckqJDDXV OnUbUAtYByaml9AkVR4GrsL7TBJYy+6ac+4tjw11kgS6X8anNXB0C8XbSWXZ/nm36tqf +/oX27eKXrvV2z9aLZvNlHzSV4C6z61bxIPz/e4Jd2Ibb/dBsYfjHrbXq7pmtZlojft7 clvcnQoGeLFQThFPPkl2tXNH3x2Q5eSX8XyYGVbaPt25CIceNisyrYbI/F0DUR7fUBKA 4nRA== X-Forwarded-Encrypted: i=1; AJvYcCUJfBdyMJnFMg73pnhdL0eC68BIKQyQ/47cIE5eSk6G4XikaQAG6MZZgo4m/I24hvMLdMR1OPp/6k3ulvs=@vger.kernel.org X-Gm-Message-State: AOJu0YyuQFZ9Fe6tLoljsvFaWHtFxqXZtCVwk2F5I1fluAgL5i8T4st0 8NCHK6F4781Dwg4S1paa0ZVAppNd92QOVYA1ho/ra2FkcMMUhIfZn2vb X-Gm-Gg: AZuq6aIkVLN08e0g8db1+GE4V9c/k3252CWKnlb2Ia+/YTiEhdekK0RS0K8IxTRQSTI RukNFewSDRLen+xyNi/4dxdgoOu3CW+/StznyXrn6j2e1l0bOWuBRmxLM49e2vMdIfhsQWq1TJW 0psmX2WBywKeRurAE3Y8PJAgQ6r4r2ynYFXDUDrnab8wlSobu4gq6SVMLr1sfBftTiGyC+G+eaQ H0ot2szhLIl/xPCVa7rouCgtrmdTnUZEHzGKOOMwJmpnT80dYtb8u5uwsYUw1bdMWCw6T+109NI sPQouLrJYu74l0lXLk9hOl29KHG46kxJTkj7Os10TSFZY69RdYewXe268ZGdTqPCsP3RSG9FyRg S2zk3lWZ0pbI7aChVND3jkkXLokczd2a7pFwdAlQwRS59lWxV3BB6S0ZEMn1iWohBu37ZgOIovH Mqe3N09lJ4F6goqNnbFdPQARW9LOI6GYypVa0fDwgwAAMogYXRRn5qKsuXMfqMZWYvtpzJkZZj X-Received: by 2002:a17:903:1aa8:b0:2ab:3ac6:8cf4 with SMTP id d9443c01a7336-2ab50598c3amr85915995ad.31.1771139409427; Sat, 14 Feb 2026 23:10:09 -0800 (PST) Received: from tabrez-VivoBook-ASUSLaptop-X513UA-KM513UA.. ([2401:4900:93c4:3183:ba57:8db4:ce19:5f69]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ad1a9d5bd3sm35445595ad.44.2026.02.14.23.10.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Feb 2026 23:10:09 -0800 (PST) From: Tabrez Ahmed To: allison.henderson@oracle.com Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Tabrez Ahmed , syzbot+aae646f09192f72a68dc@syzkaller.appspotmail.com Subject: [PATCH net] rds: tcp: fix uninit-value in __inet_bind Date: Sun, 15 Feb 2026 12:39:50 +0530 Message-ID: <20260215070951.213341-1-tabreztalks@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" KMSAN reported an uninit-value access in __inet_bind() when binding an RDS = TCP socket. The uninitialized memory originates from rds_tcp_conn_alloc(), which uses k= mem_cache_alloc() to allocate the rds_tcp_connection structure. The structure is not zero-initialized, leaving random data in its fields. When the networking stack later tries to bind the socket using these dirty = values, KMSAN flags the uninitialized access. Fix this by using kmem_cache_zalloc() instead of kmem_cache_alloc() to ensu= re the structure is zeroed out upon allocation. Reported-by: syzbot+aae646f09192f72a68dc@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3Daae646f09192f72a68dc Tested-by: syzbot+aae646f09192f72a68dc@syzkaller.appspotmail.com Fixes: 70041088e3b9 ("RDS: Add TCP transport to RDS") Signed-off-by: Tabrez Ahmed --- This is my first patch. Any feedback is appreciated! net/rds/tcp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/rds/tcp.c b/net/rds/tcp.c index 45484a93d75f..04f310255692 100644 --- a/net/rds/tcp.c +++ b/net/rds/tcp.c @@ -373,7 +373,7 @@ static int rds_tcp_conn_alloc(struct rds_connection *co= nn, gfp_t gfp) int ret =3D 0; =20 for (i =3D 0; i < RDS_MPATH_WORKERS; i++) { - tc =3D kmem_cache_alloc(rds_tcp_conn_slab, gfp); + tc =3D kmem_cache_zalloc(rds_tcp_conn_slab, gfp); if (!tc) { ret =3D -ENOMEM; goto fail; --=20 2.43.0