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| author | Long Li <longli@microsoft.com> | 2020-03-26 22:09:20 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-23 10:30:19 +0200 |
| commit | 731a3bc2be26c775fb70f66a273c1c10b50b0d05 (patch) | |
| tree | e85196377e62ed71e8bf2d30acc7582888f88791 /fs/cifs | |
| parent | 1421615c646a43b905055a41a7ca62215f4662f9 (diff) | |
| download | linux-stable-731a3bc2be26c775fb70f66a273c1c10b50b0d05.tar.gz linux-stable-731a3bc2be26c775fb70f66a273c1c10b50b0d05.tar.bz2 linux-stable-731a3bc2be26c775fb70f66a273c1c10b50b0d05.zip | |
cifs: Allocate encryption header through kmalloc
[ Upstream commit 3946d0d04bb360acca72db5efe9ae8440012d9dc ]
When encryption is used, smb2_transform_hdr is defined on the stack and is
passed to the transport. This doesn't work with RDMA as the buffer needs to
be DMA'ed.
Fix it by using kmalloc.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/transport.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 0c4df56c825a..70412944b267 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -392,7 +392,7 @@ smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, struct smb_rqst *rqst, int flags) { struct kvec iov; - struct smb2_transform_hdr tr_hdr; + struct smb2_transform_hdr *tr_hdr; struct smb_rqst cur_rqst[MAX_COMPOUND]; int rc; @@ -402,28 +402,34 @@ smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, if (num_rqst > MAX_COMPOUND - 1) return -ENOMEM; - memset(&cur_rqst[0], 0, sizeof(cur_rqst)); - memset(&iov, 0, sizeof(iov)); - memset(&tr_hdr, 0, sizeof(tr_hdr)); - - iov.iov_base = &tr_hdr; - iov.iov_len = sizeof(tr_hdr); - cur_rqst[0].rq_iov = &iov; - cur_rqst[0].rq_nvec = 1; - if (!server->ops->init_transform_rq) { cifs_dbg(VFS, "Encryption requested but transform callback " "is missing\n"); return -EIO; } + tr_hdr = kmalloc(sizeof(*tr_hdr), GFP_NOFS); + if (!tr_hdr) + return -ENOMEM; + + memset(&cur_rqst[0], 0, sizeof(cur_rqst)); + memset(&iov, 0, sizeof(iov)); + memset(tr_hdr, 0, sizeof(*tr_hdr)); + + iov.iov_base = tr_hdr; + iov.iov_len = sizeof(*tr_hdr); + cur_rqst[0].rq_iov = &iov; + cur_rqst[0].rq_nvec = 1; + rc = server->ops->init_transform_rq(server, num_rqst + 1, &cur_rqst[0], rqst); if (rc) - return rc; + goto out; rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); +out: + kfree(tr_hdr); return rc; } |