From: Phil Sutter Date: Thu, 27 Jul 2017 14:56:40 +0000 (+0200) Subject: netlink: Introduce nla_strdup() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2cf0c8b3e6942ecafe6ebb1a6d0328a81641bf39;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git netlink: Introduce nla_strdup() This is similar to strdup() for netlink string attributes. Signed-off-by: Phil Sutter Signed-off-by: Pablo Neira Ayuso --- diff --git a/include/net/netlink.h b/include/net/netlink.h index ef8e6c3a80a6..c8c2eb5ae55e 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -247,6 +247,7 @@ int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, int nla_policy_len(const struct nla_policy *, int); struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); +char *nla_strdup(const struct nlattr *nla, gfp_t flags); int nla_memcpy(void *dest, const struct nlattr *src, int count); int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); int nla_strcmp(const struct nlattr *nla, const char *str); diff --git a/lib/nlattr.c b/lib/nlattr.c index fb52435be42d..f13013f7e21a 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -271,6 +271,30 @@ 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