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ksmbd: handle caseless file creation

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commit c5a709f08d40b1a082e44ffcde1aea4d2822ddd5 upstream.

Ray Zhang reported ksmbd can not create file if parent filename is
caseless.

Y:\>mkdir A
Y:\>echo 123 >a\b.txt
The system cannot find the path specified.
Y:\>echo 123 >A\b.txt

This patch convert name obtained by caseless lookup to parent name.

Cc: stable@vger.kernel.org # v5.15+
Reported-by: Ray Zhang <zhanglei002@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon
2024-09-08 15:23:48 +09:00
committed by Greg Kroah-Hartman
parent 5fb2b18be9
commit d1b2d2a9c9
1 changed files with 3 additions and 7 deletions
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10
fs/smb/server/vfs.c
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@@ -1154,7 +1154,7 @@ static bool __caseless_lookup(struct dir_context *ctx, const char *name,
if (cmp < 0)
cmp = strncasecmp((char *)buf->private, name, namlen);
if (!cmp) {
memcpy((char *)buf->private, name, namlen);
memcpy((char *)buf->private, name, buf->used);
buf->dirent_count = 1;
return false;
}
@@ -1220,10 +1220,7 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
char *filepath;
size_t path_len, remain_len;
filepath = kstrdup(name, GFP_KERNEL);
if (!filepath)
return -ENOMEM;
filepath = name;
path_len = strlen(filepath);
remain_len = path_len;
@@ -1266,10 +1263,9 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
err = -EINVAL;
out2:
path_put(parent_path);
out1:
kfree(filepath);
}
out1:
if (!err) {
err = mnt_want_write(parent_path->mnt);
if (err) {