From: Enzo Matsumiya ematsumiya@suse.de
[ Upstream commit 09a1f9a168ae1f69f701689429871793174417d2 ]
If an error happens while getting the key or session in the ->calc_signature implementations, 0 (success) is returned. Fix it by returning a proper error code.
Since it seems to be highly unlikely to happen wrap the rc check in unlikely() too.
Reviewed-by: Ronnie Sahlberg lsahlber@redhat.com Fixes: 32811d242ff6 ("cifs: Start using per session key for smb2/3 for signature generation") Signed-off-by: Enzo Matsumiya ematsumiya@suse.de Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/cifs/smb2transport.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c index 1a5fc3314dbf..4640fc4a8b13 100644 --- a/fs/cifs/smb2transport.c +++ b/fs/cifs/smb2transport.c @@ -225,9 +225,9 @@ smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server, struct smb_rqst drqst;
ses = smb2_find_smb_ses(server, le64_to_cpu(shdr->SessionId)); - if (!ses) { + if (unlikely(!ses)) { cifs_server_dbg(VFS, "%s: Could not find session\n", __func__); - return 0; + return -ENOENT; }
memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); @@ -557,8 +557,10 @@ smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server, u8 key[SMB3_SIGN_KEY_SIZE];
rc = smb2_get_sign_key(le64_to_cpu(shdr->SessionId), server, key); - if (rc) - return 0; + if (unlikely(rc)) { + cifs_server_dbg(VFS, "%s: Could not get signing key\n", __func__); + return rc; + }
if (allocate_crypto) { rc = cifs_alloc_hash("cmac(aes)", &hash, &sdesc);