@@ -141,6 +141,7 @@ void bios_linker_loader_add_pointer(GArray *linker,
uint8_t pointer_size)
{
BiosLinkerLoaderEntry entry;
+ size_t offset = (gchar *)pointer - table->data;
memset(&entry, 0, sizeof entry);
strncpy(entry.pointer.dest_file, dest_file,
@@ -148,7 +149,8 @@ void bios_linker_loader_add_pointer(GArray *linker,
strncpy(entry.pointer.src_file, src_file,
sizeof entry.pointer.src_file - 1);
entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_POINTER);
- entry.pointer.offset = cpu_to_le32((gchar *)pointer - table->data);
+ assert(table->len >= offset + pointer_size);
+ entry.pointer.offset = cpu_to_le32(offset);
entry.pointer.size = pointer_size;
assert(pointer_size == 1 || pointer_size == 2 ||
pointer_size == 4 || pointer_size == 8);
buios linker assumes pointer parameter it gets is within table, validate this. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- hw/acpi/bios-linker-loader.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)