sd-journal: properly convert object->size on big endian

mmap code crashes when attempting to map an object of zero size.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=758392
https://bugs.freedesktop.org/show_bug.cgi?id=82894

diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
index 3d416820b0ac9a0d92bf55b51c4b2b4fe2ae4a0b..da2ef3b79534b95789143919a9e86657c7f7ac68 100644 (file)
--- a/src/journal/journal-file.h
+++ b/src/journal/journal-file.h
@@ -214,14 +214,15 @@ static unsigned type_to_context(int type) {
 
 static inline int journal_file_object_keep(JournalFile *f, Object *o, uint64_t offset) {
         unsigned context = type_to_context(o->object.type);
 
 static inline int journal_file_object_keep(JournalFile *f, Object *o, uint64_t offset) {
         unsigned context = type_to_context(o->object.type);

+        uint64_t s = le64toh(o->object.size);

 
         return mmap_cache_get(f->mmap, f->fd, f->prot, context, true,
 
         return mmap_cache_get(f->mmap, f->fd, f->prot, context, true,

-                              offset, o->object.size, &f->last_stat, NULL);
+                              offset, s, &f->last_stat, NULL);

 }
 
 static inline int journal_file_object_release(JournalFile *f, Object *o, uint64_t offset) {
         unsigned context = type_to_context(o->object.type);
 }
 
 static inline int journal_file_object_release(JournalFile *f, Object *o, uint64_t offset) {
         unsigned context = type_to_context(o->object.type);

+        uint64_t s = le64toh(o->object.size);

 
 

-        return mmap_cache_release(f->mmap, f->fd, f->prot, context,
-                                  offset, o->object.size);
+        return mmap_cache_release(f->mmap, f->fd, f->prot, context, offset, s);

 }
 }