From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Dominique Martinet <asmadeus@codewreck.org>,
Su Hui <suhui@nfschina.com>,
Christian Schoenebeck <linux_oss@crudebyte.com>,
Sasha Levin <sashal@kernel.org>,
ericvh@kernel.org, lucho@ionkov.net, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
v9fs@lists.linux.dev, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 6/6] 9p: v9fs_listxattr: fix %s null argument warning
Date: Tue, 7 Nov 2023 18:24:42 -0500 [thread overview]
Message-ID: <20231107232446.3776662-6-sashal@kernel.org> (raw)
In-Reply-To: <20231107232446.3776662-1-sashal@kernel.org>
From: Dominique Martinet <asmadeus@codewreck.org>
[ Upstream commit 9b5c6281838fc84683dd99b47302d81fce399918 ]
W=1 warns about null argument to kprintf:
In file included from fs/9p/xattr.c:12:
In function ‘v9fs_xattr_get’,
inlined from ‘v9fs_listxattr’ at fs/9p/xattr.c:142:9:
include/net/9p/9p.h:55:2: error: ‘%s’ directive argument is null
[-Werror=format-overflow=]
55 | _p9_debug(level, __func__, fmt, ##__VA_ARGS__)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Use an empty string instead of :
- this is ok 9p-wise because p9pdu_vwritef serializes a null string
and an empty string the same way (one '0' word for length)
- since this degrades the print statements, add new single quotes for
xattr's name delimter (Old: "file = (null)", new: "file = ''")
Link: https://lore.kernel.org/r/20231008060138.517057-1-suhui@nfschina.com
Suggested-by: Su Hui <suhui@nfschina.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Acked-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Message-ID: <20231025103445.1248103-2-asmadeus@codewreck.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/9p/xattr.c | 5 +++--
net/9p/client.c | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index ee331845e2c7a..31799ac10e33a 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -73,7 +73,7 @@ ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
struct p9_fid *fid;
int ret;
- p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
+ p9_debug(P9_DEBUG_VFS, "name = '%s' value_len = %zu\n",
name, buffer_size);
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
@@ -144,7 +144,8 @@ int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
- return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
+ /* Txattrwalk with an empty string lists xattrs instead */
+ return v9fs_xattr_get(dentry, "", buffer, buffer_size);
}
static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
diff --git a/net/9p/client.c b/net/9p/client.c
index c4c1e44cd7ca3..3696e9373e687 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -2018,7 +2018,7 @@ struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
goto error;
}
p9_debug(P9_DEBUG_9P,
- ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
+ ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n",
file_fid->fid, attr_fid->fid, attr_name);
req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
--
2.42.0
prev parent reply other threads:[~2023-11-07 23:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20231107232446.3776662-1-sashal@kernel.org>
2023-11-07 23:24 ` [PATCH AUTOSEL 5.15 5/6] 9p/trans_fd: Annotate data-racy writes to file::f_flags Sasha Levin
2023-11-07 23:24 ` Sasha Levin [this message]
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