From: Muhammad Usama Anjum <musamaanjum@gmail.com>
Date: Thu, 15 Apr 2021 20:24:09 +0500
Subject: [PATCH] cifs: remove unnecessary copies of tcon->crfid.fid
Git-commit: ad7567bc65afe0ef0d1b853aa4d54c44d09223dc
References: bsc#1190317
Patch-mainline: v5.13-rc1
pfid is being set to tcon->crfid.fid and they are copied in each other
multiple times. Remove the memcopy between same pointers - memory
locations.
Addresses-Coverity: ("Overlapped copy")
Fixes: 9e81e8ff74b9 ("cifs: return cached_fid from open_shroot")
Signed-off-by: Muhammad Usama Anjum <musamaanjum@gmail.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/smb2ops.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 66b20762c2c9..5ccc36d98dad 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -848,11 +848,9 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
};
/*
- * caller expects this func to set pfid to a valid
- * cached root, so we copy the existing one and get a
- * reference.
+ * caller expects this func to set the fid in crfid to valid
+ * cached root, so increment the refcount.
*/
- memcpy(pfid, tcon->crfid.fid, sizeof(*pfid));
kref_get(&tcon->crfid.refcount);
mutex_unlock(&tcon->crfid.fid_mutex);
@@ -885,7 +883,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
#endif /* CIFS_DEBUG2 */
- memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
tcon->crfid.tcon = tcon;
tcon->crfid.is_valid = true;
tcon->crfid.dentry = dentry;
@@ -894,6 +891,10 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
/* BB TBD check to see if oplock level check can be removed below */
if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
+ /*
+ * See commit 2f94a3125b87. Increment the refcount when we
+ * get a lease for root, release it if lease break occurs
+ */
kref_get(&tcon->crfid.refcount);
tcon->crfid.has_lease = true;
smb2_parse_contexts(server, o_rsp,
--
2.33.0