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CIFS: Use memdup_user() rather than duplicating its implementation

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Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

Generated by: scripts/coccinelle/api/memdup_user.cocci

Fixes: f5b05d622a ("cifs: add IOCTL for QUERY_INFO passthrough to userspace")
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Markus Elfring 2019-11-05 21:30:25 +01:00 committed by Steve French
parent acd4680e2b
commit cfaa118109
1 changed files with 4 additions and 9 deletions
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13
fs/cifs/smb2ops.c
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@ -1402,15 +1402,10 @@ smb2_ioctl_query_info(const unsigned int xid,
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
buffer = kmalloc(qi.output_buffer_length, GFP_KERNEL);
if (buffer == NULL)
return -ENOMEM;
if (copy_from_user(buffer, arg + sizeof(struct smb_query_info),
qi.output_buffer_length)) {
rc = -EFAULT;
goto iqinf_exit;
}
buffer = memdup_user(arg + sizeof(struct smb_query_info),
qi.output_buffer_length);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
/* Open */
memset(&open_iov, 0, sizeof(open_iov));