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([221.156.231.192]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a9f1c17b63sm5554792a91.12.2026.10.08.08.25.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2026 08:25:53 -0700 (PDT) From: DaeMyung Kang To: Namjae Jeon Cc: Sergey Senozhatsky , Tom Talpey , ChenXiaoSong , linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, DaeMyung Kang , stable@vger.kernel.org Subject: [PATCH 1/3] ksmbd: return end of file for reads past a named stream's data Date: Fri, 9 Oct 2026 00:25:35 +0900 Message-ID: <20261008152537.4147299-2-charsyam@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261008152537.4147299-1-charsyam@gmail.com> References: <20261008152537.4147299-1-charsyam@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A READ on a non-empty named stream at or beyond its end fails with STATUS_INVALID_PARAMETER. ksmbd_vfs_stream_read() returns -EINVAL when the offset is not below the stream length, and smb2_read() maps -EINVAL to that status. smb2_read() already turns a zero-byte read into STATUS_END_OF_FILE, the status a regular file returns at its end, and an empty stream already takes that path. Return 0 instead of -EINVAL so that non-empty streams do the same. Clients that read a stream until end of file otherwise get an error once they have read all of its data. The buffered copychunk path converts a zero-byte source read to -EIO, as it does for a regular file that shrinks during copying. Fixes: 2ae1a6cc4302 ("cifsd: fix potential read overflow in ksmbd_vfs_stream_read()") Cc: stable@vger.kernel.org Signed-off-by: DaeMyung Kang --- fs/smb/server/vfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c index 74cd8007a..ae9f9a693 100644 --- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -269,7 +269,7 @@ static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, return (int)v_len; if (v_len <= *pos) { - count = -EINVAL; + count = 0; goto free_buf; } -- 2.43.0