From 5c741d4f2215371ae17e3dbdf3d46da850662e13 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sun, 19 Feb 2017 16:08:31 -0500 Subject: SUNRPC: Add a helper function xdr_stream_decode_string_dup() Create a helper function that decodes a xdr string object, allocates a memory buffer and then store it as a NUL terminated string. Signed-off-by: Trond Myklebust Reviewed-by: Chuck Lever Signed-off-by: Anna Schumaker --- net/sunrpc/xdr.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 7f1071e103ca..1f7082144e01 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -1518,3 +1518,37 @@ out: } EXPORT_SYMBOL_GPL(xdr_process_buf); +/** + * xdr_stream_decode_string_dup - Decode and duplicate variable length string + * @xdr: pointer to xdr_stream + * @str: location to store pointer to string + * @maxlen: maximum acceptable string length + * @gfp_flags: GFP mask to use + * + * Return values: + * On success, returns length of NUL-terminated string stored in *@ptr + * %-EBADMSG on XDR buffer overflow + * %-EMSGSIZE if the size of the string would exceed @maxlen + * %-ENOMEM on memory allocation failure + */ +ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str, + size_t maxlen, gfp_t gfp_flags) +{ + void *p; + ssize_t ret; + + ret = xdr_stream_decode_opaque_inline(xdr, &p, maxlen); + if (ret > 0) { + char *s = kmalloc(ret + 1, gfp_flags); + if (s != NULL) { + memcpy(s, p, ret); + s[ret] = '\0'; + *str = s; + return strlen(s); + } + ret = -ENOMEM; + } + *str = NULL; + return ret; +} +EXPORT_SYMBOL_GPL(xdr_stream_decode_string_dup); -- cgit v1.2.3