From ce61b605a00502c59311d0a4b1f58d62b48272d0 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Tue, 20 Aug 2024 22:07:38 +0900 Subject: [PATCH] ksmbd: the buffer of smb2 query dir response has at least 1 byte When STATUS_NO_MORE_FILES status is set to smb2 query dir response, ->StructureSize is set to 9, which mean buffer has 1 byte. This issue occurs because ->Buffer[1] in smb2_query_directory_rsp to flex-array. Fixes: eb3e28c1e89b ("smb3: Replace smb2pdu 1-element arrays with flex-arrays") Cc: stable@vger.kernel.org # v6.1+ Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/smb/server/smb2pdu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index 0bc9edf22ba40..e9204180919e3 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -4409,7 +4409,8 @@ int smb2_query_dir(struct ksmbd_work *work) rsp->OutputBufferLength = cpu_to_le32(0); rsp->Buffer[0] = 0; rc = ksmbd_iov_pin_rsp(work, (void *)rsp, - sizeof(struct smb2_query_directory_rsp)); + offsetof(struct smb2_query_directory_rsp, Buffer) + + 1); if (rc) goto err_out; } else {