[PATCH v4 1/7] CIFS: Add safe access to is_valid_oplock and dump_detail ops struct field

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Signed-off-by: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
---
 fs/cifs/connect.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ccafded..3647b1a 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1058,13 +1058,15 @@ cifs_demultiplex_thread(void *p)
 		if (mid_entry != NULL) {
 			if (!mid_entry->multiRsp || mid_entry->multiEnd)
 				mid_entry->callback(mid_entry);
-		} else if (!server->ops->is_oplock_break(buf, server)) {
+		} else if (!server->ops->is_oplock_break ||
+			   !server->ops->is_oplock_break(buf, server)) {
 			cERROR(1, "No task to wake, unknown frame received! "
 				   "NumMids %d", atomic_read(&midCount));
 			cifs_dump_mem("Received Data is: ", buf,
 				      HEADER_SIZE(server));
 #ifdef CONFIG_CIFS_DEBUG2
-			server->ops->dump_detail(buf);
+			if (server->ops->dump_detail)
+				server->ops->dump_detail(buf);
 			cifs_dump_mids(server);
 #endif /* CIFS_DEBUG2 */
 
-- 
1.7.1

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