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authorPavel Shilovsky <pshilov@microsoft.com>2017-08-24 15:16:40 -0700
committerSteve French <smfrench@gmail.com>2017-08-30 14:42:30 -0500
commit9e37b1784f2be9397a903307574ee565bbadfd75 (patch)
treed485d557ef21b1d5dc0d8f33dc920a8252934b97
parent36fde05f3fb51edea879636db590d70e11f16c82 (diff)
CIFS: Fix maximum SMB2 header size
Currently the maximum size of SMB2/3 header is set incorrectly which leads to hanging of directory listing operations on encrypted SMB3 connections. Fix this by setting the maximum size to 170 bytes that is calculated as RFC1002 length field size (4) + transform header size (52) + SMB2 header size (64) + create response size (56). Cc: <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Sachin Prabhu <sprabhu@redhat.com>
-rw-r--r--fs/cifs/smb2pdu.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 18700fd25a0b..2826882c81d1 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -84,8 +84,8 @@
#define NUMBER_OF_SMB2_COMMANDS 0x0013
-/* BB FIXME - analyze following length BB */
-#define MAX_SMB2_HDR_SIZE 0x78 /* 4 len + 64 hdr + (2*24 wct) + 2 bct + 2 pad */
+/* 4 len + 52 transform hdr + 64 hdr + 56 create rsp */
+#define MAX_SMB2_HDR_SIZE 0x00b0
#define SMB2_PROTO_NUMBER cpu_to_le32(0x424d53fe)
#define SMB2_TRANSFORM_PROTO_NUM cpu_to_le32(0x424d53fd)