[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1243628376-22905-26-git-send-email-ebiederm@xmission.com>
Date: Fri, 29 May 2009 13:19:36 -0700
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...e.de>
Cc: <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
Cornelia Huck <cornelia.huck@...ibm.com>,
<linux-fsdevel@...r.kernel.org>,
Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 26/26] sysfs: In sysfs_add_one fail if the targe directory has been removed.
From: Eric W. Biederman <ebiederm@...ssion.com>
If a bug in the upper layers results in someone attempting to add
to a sysfs directory that has already been removed, warn about it
and fail.
I don't believe this has ever happened, and it certainly never should
happen, but be strict to avoid errors creeping in.
Acked-by: Kay Sievers <kay.sievers@...y.org>
Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
fs/sysfs/dir.c | 37 +++++++++++++++++++++++--------------
1 files changed, 23 insertions(+), 14 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 7da42fb..fda141d 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -394,21 +394,17 @@ static char *sysfs_pathname(struct sysfs_dirent *sd, char *path)
int sysfs_add_one(struct sysfs_dirent *parent_sd, struct sysfs_dirent *sd)
{
struct iattr *ps_iattr;
+ char *path;
+ int result;
mutex_lock(&sysfs_mutex);
- if (sysfs_find_dirent(parent_sd, sd->s_name)) {
- char *path;
- mutex_unlock(&sysfs_mutex);
- path = kzalloc(PATH_MAX, GFP_KERNEL);
- WARN(1, KERN_WARNING
- "sysfs: cannot create duplicate filename '%s'\n",
- (path == NULL) ? sd->s_name :
- strcat(strcat(sysfs_pathname(parent_sd, path), "/"),
- sd->s_name));
- kfree(path);
- return -EEXIST;
- }
+ result = -ENOENT;
+ if (parent_sd->s_flags & SYSFS_FLAG_REMOVED)
+ goto out_err;
+
+ if (sysfs_find_dirent(parent_sd, sd->s_name))
+ goto out_err;
sd->s_parent = sysfs_get(parent_sd);
sysfs_link_sibling(sd);
@@ -417,9 +413,22 @@ int sysfs_add_one(struct sysfs_dirent *parent_sd, struct sysfs_dirent *sd)
ps_iattr = parent_sd->s_iattr;
if (ps_iattr)
ps_iattr->ia_ctime = ps_iattr->ia_mtime = CURRENT_TIME;
-
mutex_unlock(&sysfs_mutex);
return 0;
+
+out_err:
+ mutex_unlock(&sysfs_mutex);
+
+ path = kzalloc(PATH_MAX, GFP_KERNEL);
+ WARN(1, KERN_WARNING "sysfs: cannot create '%s' %s\n",
+ (path == NULL) ? sd->s_name :
+ strcat(strcat(sysfs_pathname(parent_sd, path), "/"),
+ sd->s_name),
+ (result == -EEXIST ? "duplicate filename" : "no such directory")
+ );
+ kfree(path);
+
+ return result;
}
/**
--
1.6.3.1.54.g99dd.dirty
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists