SMB3: Kernel oops mounting a encryptData share with CONFIG_DEBUG_VIRTUAL

Fix kernel oops when mounting a encryptData CIFS share with
CONFIG_DEBUG_VIRTUAL

Signed-off-by: Sebastien Tisserant <stisserant@wallix.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 19589922ef2b..64a5864127be 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3489,7 +3489,15 @@ fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
                                    unsigned int buflen)
 {
-        sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
+        void *addr;
+        /*
+         * VMAP_STACK (at least) puts stack into the vmalloc address space
+         */
+        if (is_vmalloc_addr(buf))
+                addr = vmalloc_to_page(buf);
+        else
+                addr = virt_to_page(buf);
+        sg_set_page(sg, addr, buflen, offset_in_page(buf));
 }
 
 /* Assumes the first rqst has a transform header as the first iov.