[tor-commits] [tor/master] Fix formatting in tor_assertf() message in struct_check_magic().

[nickm at torproject.org]

commit b4977d1aa9366cdb1475664bcf1486fbfdf5a166
Author: Nick Mathewson <nickm at torproject.org>
Date:   Mon Dec 16 15:31:23 2019 -0500

    Fix formatting in tor_assertf() message in struct_check_magic().
    
    Closes 32771; bugfix on 0.4.2.1-alpha.
---
 changes/bug32771            | 4 ++++
 src/lib/confmgt/structvar.c | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/changes/bug32771 b/changes/bug32771
new file mode 100644
index 000000000..606bcf4be
--- /dev/null
+++ b/changes/bug32771
@@ -0,0 +1,4 @@
+  o Minor bugfixes (logging, crash):
+    - Avoid a possible crash when trying to log a (fatal) assertion failure
+      about mismatched magic numbers in configuration objects. Fixes bug 32771;
+      bugfix on 0.4.2.1-alpha.
diff --git a/src/lib/confmgt/structvar.c b/src/lib/confmgt/structvar.c
index de678d18c..7a3b8c7df 100644
--- a/src/lib/confmgt/structvar.c
+++ b/src/lib/confmgt/structvar.c
@@ -53,8 +53,8 @@ struct_check_magic(const void *object, const struct_magic_decl_t *decl)
   const uint32_t *ptr = STRUCT_VAR_P(object, decl->magic_offset);
   tor_assertf(*ptr == decl->magic_val,
               "Bad magic number on purported %s object. "
-              "Expected %"PRIu32"x but got "PRIu32"x.",
-              decl->magic_val, *ptr);
+              "Expected %"PRIu32"x but got %"PRIu32"x.",
+              decl->typename, decl->magic_val, *ptr);
 }
 
 /**