This is a note to let you know that I've just added the patch titled SMB3: Resolve data corruption of TCP server info fields to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: smb3-resolve-data-corruption-of-tcp-server-info-fields.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 62593011247c8a8cfeb0c86aff84688b196727c2 Mon Sep 17 00:00:00 2001 From: Rohith Surabattula <rohiths@xxxxxxxxxxxxx> Date: Thu, 8 Oct 2020 09:58:41 +0000 Subject: SMB3: Resolve data corruption of TCP server info fields From: Rohith Surabattula <rohiths@xxxxxxxxxxxxx> commit 62593011247c8a8cfeb0c86aff84688b196727c2 upstream. TCP server info field server->total_read is modified in parallel by demultiplex thread and decrypt offload worker thread. server->total_read is used in calculation to discard the remaining data of PDU which is not read into memory. Because of parallel modification, server->total_read can get corrupted and can result in discarding the valid data of next PDU. Signed-off-by: Rohith Surabattula <rohiths@xxxxxxxxxxxxx> Reviewed-by: Aurelien Aptel <aaptel@xxxxxxxx> Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx> CC: Stable <stable@xxxxxxxxxxxxxxx> #5.4+ Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/smb2ops.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -4103,7 +4103,8 @@ smb3_is_transform_hdr(void *buf) static int decrypt_raw_data(struct TCP_Server_Info *server, char *buf, unsigned int buf_data_size, struct page **pages, - unsigned int npages, unsigned int page_data_size) + unsigned int npages, unsigned int page_data_size, + bool is_offloaded) { struct kvec iov[2]; struct smb_rqst rqst = {NULL}; @@ -4129,7 +4130,8 @@ decrypt_raw_data(struct TCP_Server_Info memmove(buf, iov[1].iov_base, buf_data_size); - server->total_read = buf_data_size + page_data_size; + if (!is_offloaded) + server->total_read = buf_data_size + page_data_size; return rc; } @@ -4342,7 +4344,7 @@ static void smb2_decrypt_offload(struct struct mid_q_entry *mid; rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size, - dw->ppages, dw->npages, dw->len); + dw->ppages, dw->npages, dw->len, true); if (rc) { cifs_dbg(VFS, "error decrypting rc=%d\n", rc); goto free_pages; @@ -4448,7 +4450,7 @@ receive_encrypted_read(struct TCP_Server non_offloaded_decrypt: rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size, - pages, npages, len); + pages, npages, len, false); if (rc) goto free_pages; @@ -4504,7 +4506,7 @@ receive_encrypted_standard(struct TCP_Se server->total_read += length; buf_size = pdu_length - sizeof(struct smb2_transform_hdr); - length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0); + length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false); if (length) return length; Patches currently in stable-queue which might be from rohiths@xxxxxxxxxxxxx are queue-5.9/smb3-resolve-data-corruption-of-tcp-server-info-fields.patch