From: Michael Poole <mdpoole@troilus.org>
Date: Fri, 27 Jul 2007 03:15:23 +0000 (-0400)
Subject: Avoid trying to mmap() or read a zero-byte database file.
X-Git-Tag: v1.4.0-rc1~3
X-Git-Url: http://git.pk910.de/?p=srvx.git;a=commitdiff_plain;h=5c54660f454c28a83d4b3c35b57cca9ad855f7e4

Avoid trying to mmap() or read a zero-byte database file.

src/recdb.c (parse_database): If the file is empty, we can just return an
  empty database without trying to mmap() it (zero-sized mmap generates
  EINVAL) or trying to read it.
---

diff --git a/src/recdb.c b/src/recdb.c
index 17dbccc..cba9813 100644
--- a/src/recdb.c
+++ b/src/recdb.c
@@ -93,7 +93,7 @@ typedef struct recdb_outfile {
 } RECDB_OUT;
 
 #ifdef HAVE_MMAP
-static int mmap_error=0;
+static int mmap_error;
 #endif
 
 #define EOL '\n'
@@ -616,6 +616,9 @@ parse_database(const char *filename)
         return NULL;
     }
     recdb.length = (size_t)statinfo.st_size;
+    if (recdb.length == 0) {
+        return alloc_database();
+    }
 
 #ifdef HAVE_MMAP
     /* Try mmap */