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Thu, 13 Aug 2026 11:34:31 -0700 (PDT) Received: from localhost.localdomain ([2804:7f0:b103:29aa:a46e:b8bb:4db6:5c63]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-31ebfc3ca41sm10226567eec.21.2026.08.13.11.34.28 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 13 Aug 2026 11:34:30 -0700 (PDT) From: Joas Antonio To: horms@verge.net.au, ja@ssi.bg, pablo@netfilter.org, fw@strlen.de Cc: netdev@vger.kernel.org, lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-kernel@vger.kernel.org, Joas Antonio dos Santos Subject: [PATCH v2 ipvs] ipvs: fix integer overflow in ftp helper port/address parsing Date: Thu, 13 Aug 2026 15:34:24 -0300 Message-Id: <20260813183424.47522-1-joasantonio108@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: lvs-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Joas Antonio dos Santos ip_vs_ftp_get_addrport() accumulates decimal digits into a __u16 (hport) and into unsigned char (p[]) without checking for overflow. A crafted FTP PASV/EPSV response with an over-long port or address octet wraps the value, so the helper configures the data connection with a truncated port/address. The netfilter conntrack FTP helper had the same defect, fixed in commit 2b413fc689ba ("netfilter: nf_conntrack_ftp: avoid u16 overflows"). Apply the equivalent fix here: widen the port accumulator to u32 and reject values above 65535, and reject address octets above 255. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Joas Antonio dos Santos --- v2: use real name in Signed-off-by, add subsystem tag to subject (per Pablo Neira Ayuso) net/netfilter/ipvs/ip_vs_ftp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c index b315c608f..9e3e005a8 100644 --- a/net/netfilter/ipvs/ip_vs_ftp.c +++ b/net/netfilter/ipvs/ip_vs_ftp.c @@ -102,7 +102,7 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, char *s, c; unsigned char p[6]; char edelim; - __u16 hport; + __u32 hport; int i = 0; if (data_limit - data < plen) { @@ -144,7 +144,11 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, return -1; c = *data; if (isdigit(c)) { - p[i] = p[i]*10 + c - '0'; + unsigned int val = p[i] * 10 + c - '0'; + + if (val > 255) + return -1; + p[i] = val; } else if (c == ',' && i < 5) { i++; p[i] = 0; @@ -222,6 +226,8 @@ static int ip_vs_ftp_get_addrport(char *data, char *data_limit, if (!isdigit(*s)) break; hport = hport * 10 + *s - '0'; + if (hport > 65535) + return -1; } if (s == data_limit || !hport || *s != edelim) return -1; -- 2.39.5 (Apple Git-154)