linux-kernel - [PATCH v1] fs:smb:Fix unsigned expression compared with zero

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Message-Id: <20230701055556.23632-1-machel@vivo.com>
Date:   Sat,  1 Jul 2023 13:55:45 +0800
From:   Wang Ming <machel@...o.com>
To:     Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <sfrench@...ba.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Tom Talpey <tom@...pey.com>, linux-cifs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Wang Ming <machel@...o.com>
Subject: [PATCH v1] fs:smb:Fix unsigned expression compared with zero

The return value of the ksmbd_vfs_getcasexattr() is long.
However, the return value is being assigned to an unsignef
long variable 'v_len',so making 'v_len' to long. Also, when
comparing to zero in the following code, no type conversion
is required.

silence the warning:
./fs/smb/server/vfs.c:WARNING: Unsigned expression compared
with zero: v_len > 0

Signed-off-by: Wang Ming <machel@...o.com>
---
 fs/smb/server/vfs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index e35914457..e605ee96b 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -412,7 +412,8 @@ static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
 {
        char *stream_buf = NULL, *wbuf;
        struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
-       size_t size, v_len;
+       size_t size;
+       ssize_t v_len;
        int err = 0;

        ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
@@ -429,9 +430,9 @@ static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
                                       fp->stream.name,
                                       fp->stream.size,
                                       &stream_buf);
-       if ((int)v_len < 0) {
+       if (v_len < 0) {
                pr_err("not found stream in xattr : %zd\n", v_len);
-               err = (int)v_len;
+               err = v_len;
                goto out;
        }

--
2.25.1

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