1 files changed, 35 insertions, 7 deletions

diff --git a/kernel/fs/cifs/smb2ops.c b/kernel/fs/cifs/smb2ops.c
index 53ccdde6f..be34b4860 100644
--- a/kernel/fs/cifs/smb2ops.c
+++ b/kernel/fs/cifs/smb2ops.c
@@ -282,7 +282,7 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 		cifs_dbg(FYI, "Link Speed %lld\n",
 			le64_to_cpu(out_buf->LinkSpeed));
 	}
-
+	kfree(out_buf);
 	return rc;
 }
 #endif /* STATS2 */
@@ -536,6 +536,7 @@ smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 	server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 				      &fid->purge_cache);
 	cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
+	memcpy(cfile->fid.create_guid, fid->create_guid, 16);
 }
 
 static void
@@ -694,6 +695,7 @@ smb2_clone_range(const unsigned int xid,
 
 cchunk_out:
 	kfree(pcchunk);
+	kfree(retbuf);
 	return rc;
 }
 
@@ -818,7 +820,6 @@ smb2_duplicate_extents(const unsigned int xid,
 {
 	int rc;
 	unsigned int ret_data_len;
-	char *retbuf = NULL;
 	struct duplicate_extents_to_file dup_ext_buf;
 	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
 
@@ -844,7 +845,7 @@ smb2_duplicate_extents(const unsigned int xid,
 			FSCTL_DUPLICATE_EXTENTS_TO_FILE,
 			true /* is_fsctl */, (char *)&dup_ext_buf,
 			sizeof(struct duplicate_extents_to_file),
-			(char **)&retbuf,
+			NULL,
 			&ret_data_len);
 
 	if (ret_data_len > 0)
@@ -867,7 +868,6 @@ smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
 		   struct cifsFileInfo *cfile)
 {
 	struct fsctl_set_integrity_information_req integr_info;
-	char *retbuf = NULL;
 	unsigned int ret_data_len;
 
 	integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
@@ -879,7 +879,7 @@ smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
 			FSCTL_SET_INTEGRITY_INFORMATION,
 			true /* is_fsctl */, (char *)&integr_info,
 			sizeof(struct fsctl_set_integrity_information_req),
-			(char **)&retbuf,
+			NULL,
 			&ret_data_len);
 
 }
@@ -1036,9 +1036,12 @@ smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
 static void
 smb2_new_lease_key(struct cifs_fid *fid)
 {
-	get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
+	generate_random_uuid(fid->lease_key);
 }
 
+#define SMB2_SYMLINK_STRUCT_SIZE \
+	(sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
+
 static int
 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 		   const char *full_path, char **target_path,
@@ -1051,7 +1054,10 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 	struct cifs_fid fid;
 	struct smb2_err_rsp *err_buf = NULL;
 	struct smb2_symlink_err_rsp *symlink;
-	unsigned int sub_len, sub_offset;
+	unsigned int sub_len;
+	unsigned int sub_offset;
+	unsigned int print_len;
+	unsigned int print_offset;
 
 	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 
@@ -1072,11 +1078,33 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 		kfree(utf16_path);
 		return -ENOENT;
 	}
+
+	if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
+	    get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
+		kfree(utf16_path);
+		return -ENOENT;
+	}
+
 	/* open must fail on symlink - reset rc */
 	rc = 0;
 	symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
 	sub_len = le16_to_cpu(symlink->SubstituteNameLength);
 	sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
+	print_len = le16_to_cpu(symlink->PrintNameLength);
+	print_offset = le16_to_cpu(symlink->PrintNameOffset);
+
+	if (get_rfc1002_length(err_buf) + 4 <
+			SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
+		kfree(utf16_path);
+		return -ENOENT;
+	}
+
+	if (get_rfc1002_length(err_buf) + 4 <
+			SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
+		kfree(utf16_path);
+		return -ENOENT;
+	}
+
 	*target_path = cifs_strndup_from_utf16(
 				(char *)symlink->PathBuffer + sub_offset,
 				sub_len, true, cifs_sb->local_nls);