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8d76722355
strndup(s, strlen(s)) is a highly unidiomatic way to spell strdup(s); it's *NOT* safer in any way, since strlen() is just as sensitive to NUL-termination as strdup() is. strndup() is for situations when you need a copy of a known-sized substring, not a magic security juju to drive the bad spirits away. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Steve French <stfrench@microsoft.com>
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2020, Microsoft Corporation.
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*
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* Author(s): Steve French <stfrench@microsoft.com>
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* Suresh Jayaraman <sjayaraman@suse.de>
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* Jeff Layton <jlayton@kernel.org>
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/inet.h>
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#include <linux/ctype.h>
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#include "cifsglob.h"
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#include "cifsproto.h"
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/* extract the host portion of the UNC string */
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char *extract_hostname(const char *unc)
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{
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const char *src;
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char *dst, *delim;
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unsigned int len;
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/* skip double chars at beginning of string */
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/* BB: check validity of these bytes? */
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if (strlen(unc) < 3)
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return ERR_PTR(-EINVAL);
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for (src = unc; *src && *src == '\\'; src++)
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;
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if (!*src)
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return ERR_PTR(-EINVAL);
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/* delimiter between hostname and sharename is always '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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len = delim - src;
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dst = kmalloc((len + 1), GFP_KERNEL);
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if (dst == NULL)
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return ERR_PTR(-ENOMEM);
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memcpy(dst, src, len);
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dst[len] = '\0';
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return dst;
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}
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char *extract_sharename(const char *unc)
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{
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const char *src;
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char *delim, *dst;
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/* skip double chars at the beginning */
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src = unc + 2;
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/* share name is always preceded by '\\' now */
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delim = strchr(src, '\\');
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if (!delim)
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return ERR_PTR(-EINVAL);
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delim++;
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/* caller has to free the memory */
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dst = kstrdup(delim, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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return dst;
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}
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