Eliminiate sparse warning during usage of crypto_shash_* APIs
error: bad constant expression
Allocate memory for shash descriptors once, so that we do not kmalloc/kfree it
for every signature generation (shash descriptor for md5 hash).
>From ed7538619817777decc44b5660b52268077b74f3 Mon Sep 17 00:00:00 2001
From: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
Date: Tue, 24 Aug 2010 11:47:43 -0500
Subject: [PATCH] eliminate sparse warnings during crypto_shash_* APis usage
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
---
fs/cifs/cifsencrypt.c | 193 +++++++++++++++++++++++++++++++------------------
fs/cifs/cifsglob.h | 7 ++
2 files changed, 128 insertions(+), 72 deletions(-)
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index eef78c2..709f229 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -45,39 +45,38 @@ extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
struct TCP_Server_Info *server, char *signature)
{
- int rc = 0;
- struct {
- struct shash_desc shash;
- char ctx[crypto_shash_descsize(server->ntlmssp.md5)];
- } sdesc;
+ int rc;
if (cifs_pdu == NULL || server == NULL || signature == NULL)
return -EINVAL;
- sdesc.shash.tfm = server->ntlmssp.md5;
- sdesc.shash.flags = 0x0;
+ if (!server->ntlmssp.sdescmd5) {
+ cERROR(1,
+ "cifs_calculate_signature: can't generate signature\n");
+ return -1;
+ }
- rc = crypto_shash_init(&sdesc.shash);
+ rc = crypto_shash_init(&server->ntlmssp.sdescmd5->shash);
if (rc) {
- cERROR(1, "could not initialize master crypto API hmacmd5\n");
+ cERROR(1, "cifs_calculate_signature: oould not init md5\n");
return rc;
}
if (server->secType == RawNTLMSSP)
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
server->session_key.data.ntlmv2.key,
CIFS_NTLMV2_SESSKEY_SIZE);
else
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
(char *)&server->session_key.data,
server->session_key.len);
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
- rc = crypto_shash_final(&sdesc.shash, signature);
+ rc = crypto_shash_final(&server->ntlmssp.sdescmd5->shash, signature);
- return 0;
+ return rc;
}
@@ -115,30 +114,28 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
struct TCP_Server_Info *server, char *signature)
{
int i;
- int rc = 0;
- struct {
- struct shash_desc shash;
- char ctx[crypto_shash_descsize(server->ntlmssp.md5)];
- } sdesc;
+ int rc;
if (iov == NULL || server == NULL || signature == NULL)
return -EINVAL;
- sdesc.shash.tfm = server->ntlmssp.md5;
- sdesc.shash.flags = 0x0;
+ if (!server->ntlmssp.sdescmd5) {
+ cERROR(1, "cifs_calc_signature2: can't generate signature\n");
+ return -1;
+ }
- rc = crypto_shash_init(&sdesc.shash);
+ rc = crypto_shash_init(&server->ntlmssp.sdescmd5->shash);
if (rc) {
- cERROR(1, "could not initialize master crypto API hmacmd5\n");
+ cERROR(1, "cifs_calc_signature2: oould not init md5\n");
return rc;
}
if (server->secType == RawNTLMSSP)
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
server->session_key.data.ntlmv2.key,
CIFS_NTLMV2_SESSKEY_SIZE);
else
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
(char *)&server->session_key.data,
server->session_key.len);
@@ -146,7 +143,7 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
if (iov[i].iov_len == 0)
continue;
if (iov[i].iov_base == NULL) {
- cERROR(1, "null iovec entry");
+ cERROR(1, "cifs_calc_signature2: null iovec entry");
return -EIO;
}
/* The first entry includes a length field (which does not get
@@ -154,16 +151,16 @@ static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
if (i == 0) {
if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
break; /* nothing to sign or corrupt header */
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
iov[i].iov_base + 4, iov[i].iov_len - 4);
} else
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
iov[i].iov_base, iov[i].iov_len);
}
- rc = crypto_shash_final(&sdesc.shash, signature);
+ rc = crypto_shash_final(&server->ntlmssp.sdescmd5->shash, signature);
- return 0;
+ return rc;
}
int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
@@ -313,43 +310,48 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
wchar_t *user;
wchar_t *domain;
wchar_t *server;
- struct {
- struct shash_desc shash;
- char ctx[crypto_shash_descsize(ses->server->ntlmssp.hmacmd5)];
- } sdesc;
+
+ if (!ses->server->ntlmssp.sdeschmacmd5) {
+ cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
+ return -1;
+ }
/* calculate md4 hash of password */
E_md4hash(ses->password, nt_hash);
- sdesc.shash.tfm = ses->server->ntlmssp.hmacmd5;
- sdesc.shash.flags = 0x0;
-
crypto_shash_setkey(ses->server->ntlmssp.hmacmd5, nt_hash,
CIFS_NTHASH_SIZE);
- rc = crypto_shash_init(&sdesc.shash);
+ rc = crypto_shash_init(&ses->server->ntlmssp.sdeschmacmd5->shash);
if (rc) {
- cERROR(1, "could not initialize master crypto API hmacmd5\n");
+ cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
return rc;
}
/* convert ses->userName to unicode and uppercase */
len = strlen(ses->userName);
user = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (user == NULL)
+ if (user == NULL) {
+ cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
+ rc = -ENOMEM;
goto calc_exit_2;
+ }
len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
UniStrupr(user);
- crypto_shash_update(&sdesc.shash, (char *)user, 2 * len);
+ crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
+ (char *)user, 2 * len);
/* convert ses->domainName to unicode and uppercase */
if (ses->domainName) {
len = strlen(ses->domainName);
domain = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (domain == NULL)
+ if (domain == NULL) {
+ cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
+ rc = -ENOMEM;
goto calc_exit_1;
+ }
len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
nls_cp);
/* the following line was removed since it didn't work well
@@ -357,15 +359,19 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
Maybe converting the domain name earlier makes sense */
/* UniStrupr(domain); */
- crypto_shash_update(&sdesc.shash, (char *)domain, 2 * len);
+ crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
+ (char *)domain, 2 * len);
kfree(domain);
} else if (ses->serverName) {
len = strlen(ses->serverName);
server = kmalloc(2 + (len * 2), GFP_KERNEL);
- if (server == NULL)
+ if (server == NULL) {
+ cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
+ rc = -ENOMEM;
goto calc_exit_1;
+ }
len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
nls_cp);
/* the following line was removed since it didn't work well
@@ -373,16 +379,20 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
Maybe converting the domain name earlier makes sense */
/* UniStrupr(domain); */
- crypto_shash_update(&sdesc.shash, (char *)server, 2 * len);
+ crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
+ (char *)server, 2 * len);
kfree(server);
}
+
+ rc = crypto_shash_final(&ses->server->ntlmssp.sdeschmacmd5->shash,
+ ses->server->ntlmv2_hash);
+
calc_exit_1:
kfree(user);
calc_exit_2:
/* BB FIXME what about bytes 24 through 40 of the signing key?
compare with the NTLM example */
- rc = crypto_shash_final(&sdesc.shash, ses->server->ntlmv2_hash);
return rc;
}
@@ -442,34 +452,33 @@ CalcNTLMv2_response(const struct TCP_Server_Info *server,
char *v2_session_response)
{
int rc;
- struct {
- struct shash_desc shash;
- char ctx[crypto_shash_descsize(server->ntlmssp.hmacmd5)];
- } sdesc;
- sdesc.shash.tfm = server->ntlmssp.hmacmd5;
- sdesc.shash.flags = 0x0;
+ if (!server->ntlmssp.sdeschmacmd5) {
+ cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
+ return -1;
+ }
crypto_shash_setkey(server->ntlmssp.hmacmd5, server->ntlmv2_hash,
CIFS_HMAC_MD5_HASH_SIZE);
- rc = crypto_shash_init(&sdesc.shash);
+ rc = crypto_shash_init(&server->ntlmssp.sdeschmacmd5->shash);
if (rc) {
- cERROR(1, "could not initialize master crypto API hmacmd5\n");
+ cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
return rc;
}
memcpy(v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
server->cryptKey, CIFS_SERVER_CHALLENGE_SIZE);
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdeschmacmd5->shash,
v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
sizeof(struct ntlmv2_resp) - CIFS_SERVER_CHALLENGE_SIZE);
if (server->tilen)
- crypto_shash_update(&sdesc.shash,
+ crypto_shash_update(&server->ntlmssp.sdeschmacmd5->shash,
server->tiblob, server->tilen);
- rc = crypto_shash_final(&sdesc.shash, v2_session_response);
+ rc = crypto_shash_final(&server->ntlmssp.sdeschmacmd5->shash,
+ v2_session_response);
return rc;
}
@@ -480,10 +489,6 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
{
int rc = 0;
struct ntlmv2_resp *buf = (struct ntlmv2_resp *)resp_buf;
- struct {
- struct shash_desc shash;
- char ctx[crypto_shash_descsize(ses->server->ntlmssp.hmacmd5)];
- } sdesc;
buf->blob_signature = cpu_to_le32(0x00000101);
buf->reserved = 0;
@@ -511,21 +516,24 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
return rc;
}
+ if (!ses->server->ntlmssp.sdeschmacmd5) {
+ cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
+ return -1;
+ }
+
crypto_shash_setkey(ses->server->ntlmssp.hmacmd5,
ses->server->ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
- sdesc.shash.tfm = ses->server->ntlmssp.hmacmd5;
- sdesc.shash.flags = 0x0;
-
- rc = crypto_shash_init(&sdesc.shash);
+ rc = crypto_shash_init(&ses->server->ntlmssp.sdeschmacmd5->shash);
if (rc) {
- cERROR(1, "could not initialize master crypto API hmacmd5\n");
+ cERROR(1, "setup_ntlmv2_rsp: could not init hmacmd5\n");
return rc;
}
- crypto_shash_update(&sdesc.shash, resp_buf, CIFS_HMAC_MD5_HASH_SIZE);
+ crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
+ resp_buf, CIFS_HMAC_MD5_HASH_SIZE);
- rc = crypto_shash_final(&sdesc.shash,
+ rc = crypto_shash_final(&ses->server->ntlmssp.sdeschmacmd5->shash,
ses->server->session_key.data.ntlmv2.key);
memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
@@ -578,24 +586,65 @@ cifs_crypto_shash_release(struct TCP_Server_Info *server)
if (server->ntlmssp.hmacmd5)
crypto_free_shash(server->ntlmssp.hmacmd5);
+
+ kfree(server->ntlmssp.sdeschmacmd5);
+
+ kfree(server->ntlmssp.sdescmd5);
}
int
cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
{
+ int rc;
+ unsigned int size;
+
server->ntlmssp.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
if (!server->ntlmssp.hmacmd5 ||
IS_ERR(server->ntlmssp.hmacmd5)) {
- cERROR(1, "could not allocate master crypto API hmacmd5\n");
+ cERROR(1, "could not allocate crypto hmacmd5\n");
return 1;
}
server->ntlmssp.md5 = crypto_alloc_shash("md5", 0, 0);
if (!server->ntlmssp.md5 || IS_ERR(server->ntlmssp.md5)) {
- crypto_free_shash(server->ntlmssp.hmacmd5);
- cERROR(1, "could not allocate master crypto API md5\n");
- return 1;
+ cERROR(1, "could not allocate crypto md5\n");
+ rc = 1;
+ goto cifs_crypto_shash_allocate_ret1;
}
+ size = sizeof(struct shash_desc) +
+ crypto_shash_descsize(server->ntlmssp.hmacmd5);
+ server->ntlmssp.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
+ if (!server->ntlmssp.sdeschmacmd5) {
+ cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
+ rc = -ENOMEM;
+ goto cifs_crypto_shash_allocate_ret2;
+ }
+ server->ntlmssp.sdeschmacmd5->shash.tfm = server->ntlmssp.hmacmd5;
+ server->ntlmssp.sdeschmacmd5->shash.flags = 0x0;
+
+
+ size = sizeof(struct shash_desc) +
+ crypto_shash_descsize(server->ntlmssp.md5);
+ server->ntlmssp.sdescmd5 = kmalloc(size, GFP_KERNEL);
+ if (!server->ntlmssp.sdescmd5) {
+ cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
+ rc = -ENOMEM;
+ goto cifs_crypto_shash_allocate_ret3;
+ }
+ server->ntlmssp.sdescmd5->shash.tfm = server->ntlmssp.md5;
+ server->ntlmssp.sdescmd5->shash.flags = 0x0;
+
return 0;
+
+cifs_crypto_shash_allocate_ret3:
+ kfree(server->ntlmssp.sdeschmacmd5);
+
+cifs_crypto_shash_allocate_ret2:
+ crypto_free_shash(server->ntlmssp.md5);
+
+cifs_crypto_shash_allocate_ret1:
+ crypto_free_shash(server->ntlmssp.hmacmd5);
+
+ return rc;
}
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 49563e0..c9d0cfc 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -123,12 +123,19 @@ struct cifs_cred {
struct cifs_ace *aces;
};
+struct sdesc {
+ struct shash_desc shash;
+ char ctx[];
+};
+
struct ntlmssp_auth {
__u32 client_flags;
__u32 server_flags;
unsigned char ciphertext[CIFS_CPHTXT_SIZE];
struct crypto_shash *hmacmd5;
struct crypto_shash *md5;
+ struct sdesc *sdeschmacmd5;
+ struct sdesc *sdescmd5;
};
/*
--
1.6.0.2
--
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