merged from donkult

[apt.git] / methods / rred.cc

diff --git a/methods/rred.cc b/methods/rred.cc
index bf9294d96c328f7669df43e5a0fbb2bd716a481d..1e352d0e7850c235ef30532ec66aea20a7f7cac5 100644 (file)
--- a/methods/rred.cc
+++ b/methods/rred.cc
@@ -235,7 +235,9 @@ RredMethod::State RredMethod::patchMMap(FileFd &Patch, FileFd &From,                /*{{{*/
        MMap ed_cmds(Patch, MMap::ReadOnly);
        MMap in_file(From, MMap::ReadOnly);
 
-       if (ed_cmds.Size() == 0 || in_file.Size() == 0)
+       unsigned long long const ed_size = ed_cmds.Size();
+       unsigned long long const in_size = in_file.Size();
+       if (ed_size == 0 || in_size == 0)
                return MMAP_FAILED;
 
        EdCommand* commands = 0;
@@ -244,10 +246,10 @@ RredMethod::State RredMethod::patchMMap(FileFd &Patch, FileFd &From,              /*{{{*/
 
        const char* begin = (char*) ed_cmds.Data();
        const char* end = begin;
-       const char* ed_end = (char*) ed_cmds.Data() + ed_cmds.Size();
+       const char* ed_end = (char*) ed_cmds.Data() + ed_size;
 
        const char* input = (char*) in_file.Data();
-       const char* input_end = (char*) in_file.Data() + in_file.Size();
+       const char* input_end = (char*) in_file.Data() + in_size;
 
        size_t i;
 
@@ -331,7 +333,12 @@ RredMethod::State RredMethod::patchMMap(FileFd &Patch, FileFd &From,               /*{{{*/
                }
                if(command_count == command_alloc) {
                        command_alloc = (command_alloc + 64) * 3 / 2;
-                       commands = (EdCommand*) realloc(commands, command_alloc * sizeof(EdCommand));
+                       EdCommand* newCommands = (EdCommand*) realloc(commands, command_alloc * sizeof(EdCommand));
+                       if (newCommands == NULL) {
+                               free(commands);
+                               return MMAP_FAILED;
+                       }
+                       commands = newCommands;
                }
                commands[command_count++] = cmd;
        }