From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) (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 0C120241103 for ; Sun, 15 Feb 2026 07:10:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771139411; cv=none; b=dM81Sbu5aisB0nh11ORj4SakKe8lT11uQILCTlmHOYUhd9f0oHHawu2Vsehh9FO15fQhIk6Ga7vuAsk2Ddr/gw4DZqWV4XaUqeBxcv/I2BlNY5EvGYC/9wcoLPeAVQmR+rV71wHiIkNhKp3S9SNzjD3ztQ76Dg2ymymD3vr2BIU= 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=209.85.215.177 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-pg1-f177.google.com with SMTP id 41be03b00d2f7-c6e1dc5c5edso992825a12.1 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=Uk5TpW5lO8d0ors4x2m8KSPbYQZnJAbdKeDN2GUO6AVPoHHYC+MaPt6O+Ph9S3Q8mF 8hZxO+hXXHtA6nx4fzesz5i+qe9Llo88YACI2HH9cM/fj7b/eh/arkIBPbdcJfIOjOj1 So808DCMkP3zogOFD08LZDzwqyT5E44b4coSPbq302gfoSS47kHAgJrgzyVrnJScZnCm aibOP//d74Dz4hjG3BYleh1sq2Uu1WCDuSkEh4DhVPDCq34+QWBRd9dvM+iJ++kS6TuQ C8IDLyyMhdegC81KMJf5SOubpBOaf030ZJUdXf+JAz5qK/lmUkKSM2AzY+HytnRPN+PB h7uQ== X-Forwarded-Encrypted: i=1; AJvYcCWTEMSPqTSnrcMPDtK2/dfEI+0a2wSA4veUQ6S5FqVNUSK8A9XVugH+FlyRRu5MldYO8VLd6ww=@vger.kernel.org X-Gm-Message-State: AOJu0YzUlCV1p6O3RUuEWxtcj0xpCbHOd+RcnsFgKsUu2E1OZFDDTTFd Ypy6JLfOeG8UiA9aV/PNWGIJkEqUm54ZZV6+Pc6x5EXitndFG+BLu5SX X-Gm-Gg: AZuq6aKGIcC40Nhs7o3S0oEmwkkUbvjct8IAYkemaaih/I60u2V9+JBADWQ6r62lM98 83vpjhxIdm7Jtd3i96+SjITgznoRj2w7e0mFx05NvhcroE7Y3yr+O/Q46Nno6v4Yy+U/y9JsRoc LzNISdHVr67kRjybTjdIw0RuSu3sHgTkBScG7CxBNt+WZ4zp8grqvOl7Ui/FzHBvffvcVw/8oR3 tyayUcNjn9KubkijGOKVZkaKevLE9+P0K0F6o/1aN3zXWKr4GVMiNa0lgBwAv0PYjW4awPO25Qj IM8N/8TJbpaa1trOQYg+mYdhdfQDoM2ctbIUn1xOC2RA3Whncnl+BRiMLOKSTPPBYigwmrwIwEJ AEhmQjVROtgParklrRmfm25CfqQBWBD5ocPeI22k+bPgKU9a11+Q3MBRJF90uuuhkN9mVOG4LRe e5FWQlQBJQn1Hx2EXiXPi8KjqxCA3ja7MtfBWZfji+nbko942zhHqvR1to/QyHWRWdAPhxxrkj 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: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 kmem_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 ensure the structure is zeroed out upon allocation. Reported-by: syzbot+aae646f09192f72a68dc@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=aae646f09192f72a68dc 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 *conn, gfp_t gfp) int ret = 0; for (i = 0; i < RDS_MPATH_WORKERS; i++) { - tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); + tc = kmem_cache_zalloc(rds_tcp_conn_slab, gfp); if (!tc) { ret = -ENOMEM; goto fail; -- 2.43.0