[or-cvs] [tor/release-0.2.2] Avoid assertion on read_file_to_str() with size==SIZE_T_CEILING-1

[arma at torproject.org]

commit e365aee97110c6c6df6f56ca9814d88c3808a2d1
Author: Nick Mathewson <nickm at torproject.org>
Date:   Mon Jan 3 15:30:11 2011 -0500

    Avoid assertion on read_file_to_str() with size==SIZE_T_CEILING-1
    
    Spotted by doors, fixes bug 2326.
---
 changes/bug2326   |    6 ++++++
 src/common/util.c |    2 +-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/changes/bug2326 b/changes/bug2326
new file mode 100644
index 0000000..239a383
--- /dev/null
+++ b/changes/bug2326
@@ -0,0 +1,6 @@
+  o Minor bugfixes
+    - Fix a bug where we would assert if we ever had a
+      cached-descriptors.new file (or another file read directly into
+      memory) of exactly SIZE_T_CEILING bytes.  Found by doors; fixes
+      bug 2326; bugfix on 0.2.1.25.
+
diff --git a/src/common/util.c b/src/common/util.c
index 7a24df8..f206d00 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -1936,7 +1936,7 @@ read_file_to_str(const char *filename, int flags, struct stat *stat_out)
     return NULL;
   }
 
-  if ((uint64_t)(statbuf.st_size)+1 > SIZE_T_CEILING)
+  if ((uint64_t)(statbuf.st_size)+1 >= SIZE_T_CEILING)
     return NULL;
 
   string = tor_malloc((size_t)(statbuf.st_size+1));