__event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
/*
- * strlen_user includes \0. If returns 0, it faulted.
+ * strlen_user includes \0. If returns 0, it faulted, so we set size to
+ * 1 (\0 only).
*/
#undef __string_from_user
#define __string_from_user(_item, _src) \
- __event_len += __dynamic_len[__dynamic_len_idx++] = strlen_user(_src);
+ __event_len += __dynamic_len[__dynamic_len_idx++] = \
+ max_t(size_t, strlen_user(_src), 1);
#undef TP_PROTO
#define TP_PROTO(args...) args
goto __end_field_##dest;
/*
- * If string length is zero, this means reading the string faulted, so
- * we simply put a \0. If string length is larger than 0, it is the
- * string length including the final \0.
+ * The string length including the final \0.
*/
#undef tp_copy_string_from_user
#define tp_copy_string_from_user(dest, src) \
(void) __typemap.dest; \
lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest));\
__ustrlen = __get_dynamic_array_len(dest); \
- if (likely(__ustrlen) > 1) { \
+ if (likely(__ustrlen > 1)) { \
__chan->ops->event_write_from_user(&__ctx, src, \
__ustrlen - 1); \
} \