[image] Avoid claiming zero-length images as valid

[people/asdlkf/gpxe.git] / src / arch / i386 / image / pxe_image.c

diff --git a/src/arch/i386/image/pxe_image.c b/src/arch/i386/image/pxe_image.c
index 3b5214d..90550d8 100644 (file)
--- a/src/arch/i386/image/pxe_image.c
+++ b/src/arch/i386/image/pxe_image.c
@@ -88,6 +88,12 @@ int pxe_load ( struct image *image ) {
        if ( filesz > ( 0xa0000 - 0x7c00 ) )
                return -ENOEXEC;
 
+       /* Rejecting zero-length images is also useful, since these
+        * end up looking to the user like bugs in gPXE.
+        */
+       if ( ! filesz )
+               return -ENOEXEC;
+
        /* There are no signature checks for PXE; we will accept anything */
        if ( ! image->type )
                image->type = &pxe_image_type;