Commit c5a709f0 authored by Namjae Jeon's avatar Namjae Jeon Committed by Steve French
Browse files

ksmbd: handle caseless file creation 



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: default avatarRay Zhang <zhanglei002@gmail.com>
Signed-off-by: default avatarNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent ca4974ca

fs/smb/server/vfs.c

+3 −7
Original line number Diff line number Diff line
@@ -1167,7 +1167,7 @@ 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;

	}
@@ -1235,10 +1235,7 @@ 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;
@@ -1281,10 +1278,9 @@ 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) {