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From: David Howells <dhowells@redhat.com>
To: unlisted-recipients:; (no To-header on input)
Cc: dhowells@redhat.com, Eric Biggers <ebiggers3@gmail.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	Eric Biggers <ebiggers@google.com>
Subject: Re: [PATCH 03/18] fs_context: fix detecting full log buffer
Date: Mon, 09 Jul 2018 10:35:46 +0100	[thread overview]
Message-ID: <10922.1531128946@warthog.procyon.org.uk> (raw)
In-Reply-To: <10670.1531128774@warthog.procyon.org.uk>

David Howells <dhowells@redhat.com> wrote:

> > When 'head' and 'tail' wrap around, 'log->head - log->tail' will be
> > something like '4 - 252 = -248', and comparing that directly to the
> > array size is wrong.  Fix by casting to 'u8'.
> 
> I think a better fix is to use CIRC_CNT() or CIRC_SPACE().

Or it would be - if CIRC_CNT() and CIRC_SPACE() didn't leave a hole in the
buffer - but that's unnecessary if the head and tail counters can hold 2x the
ring size or more.

David

  parent reply	other threads:[~2018-07-09  9:35 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-08 21:01 [PATCH vfs/for-next 00/18] fs_context fixes Eric Biggers
2018-07-08 21:01 ` [PATCH 01/18] sysfs: check return value of kernfs_get_tree() Eric Biggers
2018-07-08 21:01 ` [PATCH 02/18] fs_context: fix shrinker leak in sget_fc() Eric Biggers
2018-07-08 21:01 ` [PATCH 03/18] fs_context: fix detecting full log buffer Eric Biggers
2018-07-08 21:01 ` [PATCH 04/18] fs_context: fix fs_context leak in simple_pin_fs() Eric Biggers
2018-07-08 21:01 ` [PATCH 05/18] fs_context: fix mount option blacklist Eric Biggers
2018-07-08 21:01 ` [PATCH 06/18] fs_context: fix memory leak with 's' (source) command Eric Biggers
2018-07-08 21:01 ` [PATCH 07/18] fs_context: fix double free of legacy_fs_context data Eric Biggers
2018-07-08 21:01 ` [PATCH 08/18] fsmount: pass up error code from dentry_open() Eric Biggers
2018-07-08 21:01 ` [PATCH 09/18] fsmount: fix handling FSMOUNT_CLOEXEC Eric Biggers
2018-07-08 21:01 ` [PATCH 10/18] fsmount: fix bypassing SB_MANDLOCK permission check Eric Biggers
2018-07-08 21:01 ` [PATCH 11/18] fspick: fix path leak Eric Biggers
2018-07-08 21:01 ` [PATCH 12/18] fspick: add missing permission check Eric Biggers
2018-07-08 21:01 ` [PATCH 13/18] fsmount: removed unused variable 'inode' Eric Biggers
2018-07-08 21:01 ` [PATCH 14/18] fsopen,fspick: factor out log allocation Eric Biggers
2018-07-08 21:01 ` [PATCH 15/18] fsopen,fspick: rename fsopen_create_fd() to fscontext_create_fd() Eric Biggers
2018-07-08 21:01 ` [PATCH 16/18] fs_context: de-obfuscate control flow in fscontext_read() Eric Biggers
2018-07-08 21:01 ` [PATCH 17/18] fs_context: de-obfuscate command validation Eric Biggers
2018-07-08 21:01 ` [PATCH 18/18] fs_context: fix fscontext_write() comment Eric Biggers
2018-07-08 23:46 ` [PATCH vfs/for-next 00/18] fs_context fixes Eric Biggers
2018-07-09  9:32 ` [PATCH 03/18] fs_context: fix detecting full log buffer David Howells
2018-07-09  9:35 ` David Howells [this message]
2018-07-09 12:31 ` [PATCH 07/18] fs_context: fix double free of legacy_fs_context data David Howells
2018-07-10  1:17   ` Eric Biggers
2018-07-10  1:25     ` Eric Biggers
2018-07-10  8:02   ` David Howells
2018-07-09 15:31 ` [PATCH vfs/for-next 00/18] fs_context fixes David Howells
2018-07-09 15:56   ` Al Viro
2018-07-09 16:28   ` David Howells
2018-07-09 21:57   ` David Howells

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