[Qemu-devel] [PATCH] elf-ops.h: fix int overflow in load_elf()

[Stefano Garzarella <sgarzare@redhat.com>]

This patch fixes a possible integer overflow when we calculate
the total size of ELF segments loaded.

Reported-by: Coverity (CID 1405299)
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
Now we are limited to INT_MAX, should load_elf() returns ssize_t
to support bigger ELFs?
---
 include/hw/elf_ops.h | 6 ++++++
 hw/core/loader.c     | 1 +
 2 files changed, 7 insertions(+)

diff --git a/include/hw/elf_ops.h b/include/hw/elf_ops.h
index 1496d7e753..46dd3bf413 100644
--- a/include/hw/elf_ops.h
+++ b/include/hw/elf_ops.h
@@ -485,6 +485,12 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                 }
             }
 
+            if (mem_size > INT_MAX - total_size) {
+                error_report("ELF total segments size is too big to load "
+                             "max is %d)", INT_MAX);
+                goto fail;
+            }
+
             /* address_offset is hack for kernel images that are
                linked at the wrong physical address.  */
             if (translate_fn) {
diff --git a/hw/core/loader.c b/hw/core/loader.c
index 32f7cc7c33..feda52fa88 100644
--- a/hw/core/loader.c
+++ b/hw/core/loader.c
@@ -44,6 +44,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu-common.h"
+#include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "hw/hw.h"
 #include "disas/disas.h"
-- 
2.21.0