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[34.83.123.78]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39ed362c71csm2147955a91.2.2026.09.19.14.36.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2026 14:36:33 -0700 (PDT) From: Hui Peng To: robin@protonic.nl, o.rempel@pengutronix.de, mkl@pengutronix.de, mailhol@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: kernel@pengutronix.de, socketcan@hartkopp.net, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] can: j1939: return 0 instead of user value in j1939_sk_setsockopt_flag() Date: Sat, 19 Sep 2026 21:36:32 +0000 Message-ID: <20260919213632.3313825-1-benquike@gmail.com> X-Mailer: git-send-email 2.55.0.1082.g2b9226bbc0-goog Precedence: bulk X-Mailing-List: linux-can@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In `j1939_sk_setsockopt_flag()`, after copying the integer option value `tmp` from userspace and updating `jsk->state`, the function returns `tmp` instead of `0`. If a caller passes a negative integer (e.g., `-1`) to enable `SO_J1939_BROADCAST` or `SO_J1939_PROMISC`, `if (tmp)` sets `jsk->state |= flag` and then returns the negative value as an error code from `setsockopt()`. If a caller passes a positive non-zero integer (e.g., `1`), `setsockopt()` violates POSIX by returning `1` instead of `0`. Return `0` on success in `j1939_sk_setsockopt_flag()`. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Assisted-by: LLM Signed-off-by: Hui Peng --- net/can/j1939/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index 50a598ef5fd4..1d4af472de4a 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -688,7 +688,7 @@ static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, sockptr_t optval, else jsk->state &= ~flag; release_sock(&jsk->sk); - return tmp; + return 0; } static int j1939_sk_setsockopt(struct socket *sock, int level, int optname, -- 2.55.0.1082.g2b9226bbc0-goog