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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bd0e16f4sm46863209f8f.11.2026.01.13.11.22.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 11:22:47 -0800 (PST) From: david.laight.linux@gmail.com To: Christian Brauner , Andrew Morton , Miklos Szeredi , Mark Brown , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Alexander Viro , Andreas Dilger , Kees Cook , OGAWA Hirofumi , Theodore Ts'o , Brian Masney Cc: David Laight Subject: [PATCH next] fuse: Fix 'min: signedness error' in fuse_wr_pages() Date: Tue, 13 Jan 2026 19:22:43 +0000 Message-Id: <20260113192243.73983-1-david.laight.linux@gmail.com> X-Mailer: git-send-email 2.39.5 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" From: David Laight On 32bit systems 'pos' is s64 and everything else is 32bit so the first argument to min() is signed - generating a warning. On 64bit systems 'len' is 64bit unsigned forcing everything to unsigned. Fix by reworking the exprssion to completely avoid 64bit maths on 32bit. Use DIV_ROUND_UP() instead of open-coding something equivalent. Note that the 32bit 'len' cannot overflow because the syscall interface limits read/write (etc) to (INT_MAX - PAGE_SIZE) bytes (even on 64bit). Fixes: 0f5bb0cfb0b4 ("fs: use min() or umin() instead of min_t()") Signed-off-by: David Laight Reported-by: Brian Masney Reviewed-by: Brian Masney --- fs/fuse/file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 2595b6b4922b..ff823b0545ed 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1323,8 +1323,8 @@ static ssize_t fuse_fill_write_pages(struct fuse_io_a= rgs *ia, static inline unsigned int fuse_wr_pages(loff_t pos, size_t len, unsigned int max_pages) { - return min(((pos + len - 1) >> PAGE_SHIFT) - (pos >> PAGE_SHIFT) + 1, - max_pages); + len +=3D pos % PAGE_SIZE; + return min(DIV_ROUND_UP(len, PAGE_SIZE), max_pages); } =20 static ssize_t fuse_perform_write(struct kiocb *iocb, struct iov_iter *ii) --=20 2.39.5