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bugfix: stack corruption loading IHex images 

The Hex parser uses a fixed number of sections.  When the
number of sections in the file is greater than that, the
stack get corrupted and a CHECKSUM ERROR is detected
which is very confusing.

This checks the number of sections read, and increases
IMAGE_MAX_SECTIONS so it works on my file.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
Franck HÉRÉSON 2009-10-28 10:24:55 -07:00 committed by David Brownell
parent 0b882951b7
commit 053a763aa6
2 changed files with 22 additions and 1 deletions
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21
src/target/image.c
View File

@ -8,6 +8,9 @@
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2009 by Franck Hereson *
* franck.hereson@secad.fr *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
@ -196,6 +199,12 @@ static int image_ihex_buffer_complete(image_t *image)
if (section[image->num_sections].size != 0)
{
image->num_sections++;
if (image->num_sections >= IMAGE_MAX_SECTIONS)
{
/* too many sections */
LOG_ERROR("Too many sections found in IHEX file");
return ERROR_IMAGE_FORMAT_ERROR;
}
section[image->num_sections].size = 0x0;
section[image->num_sections].flags = 0;
section[image->num_sections].private = &ihex->buffer[cooked_bytes];
@ -252,6 +261,12 @@ static int image_ihex_buffer_complete(image_t *image)
if (section[image->num_sections].size != 0)
{
image->num_sections++;
if (image->num_sections >= IMAGE_MAX_SECTIONS)
{
/* too many sections */
LOG_ERROR("Too many sections found in IHEX file");
return ERROR_IMAGE_FORMAT_ERROR;
}
section[image->num_sections].size = 0x0;
section[image->num_sections].flags = 0;
section[image->num_sections].private = &ihex->buffer[cooked_bytes];
@ -292,6 +307,12 @@ static int image_ihex_buffer_complete(image_t *image)
if (section[image->num_sections].size != 0)
{
image->num_sections++;
if (image->num_sections >= IMAGE_MAX_SECTIONS)
{
/* too many sections */
LOG_ERROR("Too many sections found in IHEX file");
return ERROR_IMAGE_FORMAT_ERROR;
}
section[image->num_sections].size = 0x0;
section[image->num_sections].flags = 0;
section[image->num_sections].private = &ihex->buffer[cooked_bytes];

2
src/target/image.h
View File

@ -33,7 +33,7 @@
#endif
#define IMAGE_MAX_ERROR_STRING (256)
#define IMAGE_MAX_SECTIONS (128)
#define IMAGE_MAX_SECTIONS (512)
#define IMAGE_MEMORY_CACHE_SIZE (2048)