From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88CA86AB9 for ; Wed, 23 Mar 2022 23:06:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55407C340E9; Wed, 23 Mar 2022 23:06:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1648076781; bh=OOOg5sV6acqca9K6Ma4LhVQnaCX2eDgI6f8HEHiTKpc=; h=Date:To:From:In-Reply-To:Subject:From; b=F4WG/SKd+1s4ZnFY6Tzeowd27azsHGWwaW7TE9T3COsUk7CkoeXcHSqjD1Vxpuv21 QTiLLaR5WSOVP799aLkM/mV0Qsxk9pMCat3dsIX5B+AXi3fYVDOAv7xJEeNM1/obIl NCILoWD9z2CKOWMdLLLZ4FFIUhhX6BMZm1lY2bWo= Date: Wed, 23 Mar 2022 16:06:20 -0700 To: christian.brauner@ubuntu.com,0x7f454c46@gmail.com,avagin@gmail.com,akpm@linux-foundation.org,patches@lists.linux.dev,linux-mm@kvack.org,mm-commits@vger.kernel.org,torvalds@linux-foundation.org,akpm@linux-foundation.org From: Andrew Morton In-Reply-To: <20220323160453.65922ced539cbf445b191555@linux-foundation.org> Subject: [patch 21/41] fs/pipe.c: local vars have to match types of proper pipe_inode_info fields Message-Id: <20220323230621.55407C340E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: From: Andrei Vagin Subject: fs/pipe.c: local vars have to match types of proper pipe_inode_info fields head, tail, ring_size are declared as unsigned int, so all local variables that operate with these fields have to be unsigned to avoid signed integer overflow. Right now, it isn't an issue because the maximum pipe size is limited by 1U<<31. Link: https://lkml.kernel.org/r/20220106171946.36128-1-avagin@gmail.com Signed-off-by: Andrei Vagin Suggested-by: Dmitry Safonov <0x7f454c46@gmail.com> Acked-by: Christian Brauner Signed-off-by: Andrew Morton --- fs/pipe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/pipe.c~fs-pipe-local-vars-has-to-match-types-of-proper-pipe_inode_info-fields +++ a/fs/pipe.c @@ -607,7 +607,7 @@ out: static long pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct pipe_inode_info *pipe = filp->private_data; - int count, head, tail, mask; + unsigned int count, head, tail, mask; switch (cmd) { case FIONREAD: @@ -829,7 +829,7 @@ out_free_uid: void free_pipe_info(struct pipe_inode_info *pipe) { - int i; + unsigned int i; #ifdef CONFIG_WATCH_QUEUE if (pipe->watch_queue) _