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-rw-r--r--net/sunrpc/xdr.c34
1 files changed, 34 insertions, 0 deletions
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);