3 files changed, 15 insertions, 3 deletions
diff --git a/src/common/compat.h b/src/common/compat.h
index b0ef63badf..7edd889ee3 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -259,11 +259,12 @@ void tor_munmap_file(tor_mmap_t *handle) ATTR_NONNULL((1));
 int tor_snprintf(char *str, size_t size, const char *format, ...)
   CHECK_PRINTF(3,4) ATTR_NONNULL((1,3));
 int tor_vsnprintf(char *str, size_t size, const char *format, va_list args)
-  ATTR_NONNULL((1,3));
+  CHECK_PRINTF(3,0) ATTR_NONNULL((1,3));
 
 int tor_asprintf(char **strp, const char *fmt, ...)
   CHECK_PRINTF(2,3);
-int tor_vasprintf(char **strp, const char *fmt, va_list args);
+int tor_vasprintf(char **strp, const char *fmt, va_list args)
+  CHECK_PRINTF(2,0);
 
 const void *tor_memmem(const void *haystack, size_t hlen, const void *needle,
                        size_t nlen) ATTR_NONNULL((1,3));
diff --git a/src/common/log.c b/src/common/log.c
index df27066f92..f509ddcd6e 100644
--- a/src/common/log.c
+++ b/src/common/log.c
@@ -137,6 +137,13 @@ static void close_log(logfile_t *victim);
 
 static char *domain_to_string(log_domain_mask_t domain,
                              char *buf, size_t buflen);
+static INLINE char *format_msg(char *buf, size_t buf_len,
+           log_domain_mask_t domain, int severity, const char *funcname,
+           const char *format, va_list ap, size_t *msg_len_out)
+  CHECK_PRINTF(6,0);
+static void logv(int severity, log_domain_mask_t domain, const char *funcname,
+                 const char *format, va_list ap)
+  CHECK_PRINTF(4,0);
 
 /** Name of the application: used to generate the message we write at the
  * start of each new log. */
diff --git a/src/common/util.h b/src/common/util.h
index 567efaafef..36601fa790 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -213,7 +213,11 @@ const char *escaped(const char *string);
 struct smartlist_t;
 void wrap_string(struct smartlist_t *out, const char *string, size_t width,
                  const char *prefix0, const char *prefixRest);
-int tor_vsscanf(const char *buf, const char *pattern, va_list ap);
+int tor_vsscanf(const char *buf, const char *pattern, va_list ap)
+#ifdef __GNUC__
+  __attribute__((format(scanf, 2, 0)))
+#endif
+  ;
 int tor_sscanf(const char *buf, const char *pattern, ...)
 #ifdef __GNUC__
   __attribute__((format(scanf, 2, 3)))