From 2cf0c8b3e6942ecafe6ebb1a6d0328a81641bf39 Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Thu, 27 Jul 2017 16:56:40 +0200 Subject: netlink: Introduce nla_strdup() This is similar to strdup() for netlink string attributes. Signed-off-by: Phil Sutter Signed-off-by: Pablo Neira Ayuso --- lib/nlattr.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'lib') diff --git a/lib/nlattr.c b/lib/nlattr.c index fb52435..f13013f 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -272,6 +272,30 @@ size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize) EXPORT_SYMBOL(nla_strlcpy); /** + * nla_strdup - Copy string attribute payload into a newly allocated buffer + * @nla: attribute to copy the string from + * @flags: the type of memory to allocate (see kmalloc). + * + * Returns a pointer to the allocated buffer or NULL on error. + */ +char *nla_strdup(const struct nlattr *nla, gfp_t flags) +{ + size_t srclen = nla_len(nla); + char *src = nla_data(nla), *dst; + + if (srclen > 0 && src[srclen - 1] == '\0') + srclen--; + + dst = kmalloc(srclen + 1, flags); + if (dst != NULL) { + memcpy(dst, src, srclen); + dst[srclen] = '\0'; + } + return dst; +} +EXPORT_SYMBOL(nla_strdup); + +/** * nla_memcpy - Copy a netlink attribute into another memory area * @dest: where to copy to memcpy * @src: netlink attribute to copy from -- cgit v1.1