[PATCH] fs: cifs: use kmemdup instead of kmalloc + memcpy

From: Silviu-Mihai Popescu
Date: Mon Mar 11 2013 - 12:22:46 EST


This replaces calls to kmalloc followed by memcpy with a single call to
kmemdup. This was found via make coccicheck.

Signed-off-by: Silviu-Mihai Popescu <silviupopescu1990@xxxxxxxxx>
---
fs/cifs/cifs_spnego.c | 3 +--
fs/cifs/cifsacl.c | 3 +--
fs/cifs/cifssmb.c | 3 +--
fs/cifs/sess.c | 8 ++++----
4 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
index 10e7747..b7ae3cb 100644
--- a/fs/cifs/cifs_spnego.c
+++ b/fs/cifs/cifs_spnego.c
@@ -37,12 +37,11 @@ cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
int ret;

ret = -ENOMEM;
- payload = kmalloc(prep->datalen, GFP_KERNEL);
+ payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL);
if (!payload)
goto error;

/* attach the data */
- memcpy(payload, prep->data, prep->datalen);
key->payload.data = payload;
ret = 0;

diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index f1e3f25..0bba930 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -63,11 +63,10 @@ cifs_idmap_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
key->datalen = prep->datalen;
return 0;
}
- payload = kmalloc(prep->datalen, GFP_KERNEL);
+ payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL);
if (!payload)
return -ENOMEM;

- memcpy(payload, prep->data, prep->datalen);
key->payload.data = payload;
key->datalen = prep->datalen;
return 0;
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 7353bc5..d900bf0 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3742,12 +3742,11 @@ CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon, __u16 fid,
rc = -EINVAL;
*pbuflen = 0;
} else {
- *acl_inf = kmalloc(*pbuflen, GFP_KERNEL);
+ *acl_inf = kmemdup(pdata, *pbuflen, GFP_KERNEL);
if (*acl_inf == NULL) {
*pbuflen = 0;
rc = -ENOMEM;
}
- memcpy(*acl_inf, pdata, *pbuflen);
}
}
qsec_out:
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 76809f4..6f83881 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -399,12 +399,12 @@ int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
return -EINVAL;
}
if (tilen) {
- ses->auth_key.response = kmalloc(tilen, GFP_KERNEL);
+ ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
+ GFP_KERNEL);
if (!ses->auth_key.response) {
cERROR(1, "Challenge target info allocation failure");
return -ENOMEM;
}
- memcpy(ses->auth_key.response, bcc_ptr + tioffset, tilen);
ses->auth_key.len = tilen;
}

@@ -761,14 +761,14 @@ ssetup_ntlmssp_authenticate:
goto ssetup_exit;
}

- ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL);
+ ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
+ GFP_KERNEL);
if (!ses->auth_key.response) {
cERROR(1, "Kerberos can't allocate (%u bytes) memory",
msg->sesskey_len);
rc = -ENOMEM;
goto ssetup_exit;
}
- memcpy(ses->auth_key.response, msg->data, msg->sesskey_len);
ses->auth_key.len = msg->sesskey_len;

pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
--
1.7.9.5

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