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([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-rdma@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