Merge tag 'v6.12-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - Fix possible double free setting xattrs

 - Fix slab out of bounds with large ioctl payload

 - Remove three unused functions, and an unused variable that could be
   confusing

* tag 'v6.12-rc3-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Remove unused functions
  smb/client: Fix logically dead code
  smb: client: fix OOBs when building SMB2_IOCTL request
  smb: client: fix possible double free in smb2_set_ea()

Author: torvalds

fs/smb/client/cifsproto.h

@@ -252,10 +252,6 @@ extern int cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
 			         unsigned int to_read);
 extern ssize_t cifs_discard_from_socket(struct TCP_Server_Info *server,
 					size_t to_read);
-extern int cifs_read_page_from_socket(struct TCP_Server_Info *server,
-					struct page *page,
-					unsigned int page_offset,
-					unsigned int to_read);
 int cifs_read_iter_from_socket(struct TCP_Server_Info *server,
 			       struct iov_iter *iter,
 			       unsigned int to_read);
@@ -623,8 +619,6 @@ enum securityEnum cifs_select_sectype(struct TCP_Server_Info *,
 int cifs_alloc_hash(const char *name, struct shash_desc **sdesc);
 void cifs_free_hash(struct shash_desc **sdesc);
 
-struct cifs_chan *
-cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server);
 int cifs_try_adding_channels(struct cifs_ses *ses);
 bool is_server_using_iface(struct TCP_Server_Info *server,
 			   struct cifs_server_iface *iface);
@@ -640,9 +634,6 @@ cifs_chan_set_in_reconnect(struct cifs_ses *ses,
 void
 cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
 			       struct TCP_Server_Info *server);
-bool
-cifs_chan_in_reconnect(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server);
 void
 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
 			     struct TCP_Server_Info *server);

fs/smb/client/compress.c

@@ -166,7 +166,6 @@ static int collect_sample(const struct iov_iter *iter, ssize_t max, u8 *sample)
 	loff_t start = iter->xarray_start + iter->iov_offset;
 	pgoff_t last, index = start / PAGE_SIZE;
 	size_t len, off, foff;
-	ssize_t ret = 0;
 	void *p;
 	int s = 0;
 
@@ -193,9 +192,6 @@ static int collect_sample(const struct iov_iter *iter, ssize_t max, u8 *sample)
 				memcpy(&sample[s], p, len2);
 				kunmap_local(p);
 
-				if (ret < 0)
-					return ret;
-
 				s += len2;
 
 				if (len2 < SZ_2K || s >= max - SZ_2K)

fs/smb/client/connect.c

@@ -794,18 +794,6 @@ cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read)
 	return cifs_readv_from_socket(server, &smb_msg);
 }
 
-int
-cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
-	unsigned int page_offset, unsigned int to_read)
-{
-	struct msghdr smb_msg = {};
-	struct bio_vec bv;
-
-	bvec_set_page(&bv, page, to_read, page_offset);
-	iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
-	return cifs_readv_from_socket(server, &smb_msg);
-}
-
 int
 cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
 			   unsigned int to_read)

fs/smb/client/sess.c

@@ -115,18 +115,6 @@ cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
 	ses->chans[chan_index].in_reconnect = false;
 }
 
-bool
-cifs_chan_in_reconnect(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	if (chan_index == CIFS_INVAL_CHAN_INDEX)
-		return true;	/* err on the safer side */
-
-	return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
-}
-
 void
 cifs_chan_set_need_reconnect(struct cifs_ses *ses,
 			     struct TCP_Server_Info *server)
@@ -487,26 +475,6 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
 	spin_unlock(&ses->chan_lock);
 }
 
-/*
- * If server is a channel of ses, return the corresponding enclosing
- * cifs_chan otherwise return NULL.
- */
-struct cifs_chan *
-cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
-{
-	int i;
-
-	spin_lock(&ses->chan_lock);
-	for (i = 0; i < ses->chan_count; i++) {
-		if (ses->chans[i].server == server) {
-			spin_unlock(&ses->chan_lock);
-			return &ses->chans[i];
-		}
-	}
-	spin_unlock(&ses->chan_lock);
-	return NULL;
-}
-
 static int
 cifs_ses_add_channel(struct cifs_ses *ses,
 		     struct cifs_server_iface *iface)

fs/smb/client/smb2ops.c

@@ -1158,7 +1158,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
 	struct cifs_fid fid;
 	unsigned int size[1];
 	void *data[1];
-	struct smb2_file_full_ea_info *ea = NULL;
+	struct smb2_file_full_ea_info *ea;
 	struct smb2_query_info_rsp *rsp;
 	int rc, used_len = 0;
 	int retries = 0, cur_sleep = 1;
@@ -1179,6 +1179,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
 	if (!utf16_path)
 		return -ENOMEM;
 
+	ea = NULL;
 	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
 	vars = kzalloc(sizeof(*vars), GFP_KERNEL);
 	if (!vars) {

fs/smb/client/smb2pdu.c

@@ -3313,6 +3313,15 @@ SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
 		return rc;
 
 	if (indatalen) {
+		unsigned int len;
+
+		if (WARN_ON_ONCE(smb3_encryption_required(tcon) &&
+				 (check_add_overflow(total_len - 1,
+						     ALIGN(indatalen, 8), &len) ||
+				  len > MAX_CIFS_SMALL_BUFFER_SIZE))) {
+			cifs_small_buf_release(req);
+			return -EIO;
+		}
 		/*
 		 * indatalen is usually small at a couple of bytes max, so
 		 * just allocate through generic pool