From: Pali Rohár Date: Wed, 11 Aug 2021 08:14:16 +0000 (+0200) Subject: tools: kwbimage: Verify size of image data X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=a008dbaa8ce2d4142e17780177faa381fd59bb4e;p=u-boot.git tools: kwbimage: Verify size of image data Part of image data is 4 byte checksum, so every image must contain at least 4 bytes. Verify it to prevent memory corruptions. Signed-off-by: Pali Rohár Reviewed-by: Stefan Roese --- diff --git a/tools/kwbimage.c b/tools/kwbimage.c index 4709c6d544..f47e52f13a 100644 --- a/tools/kwbimage.c +++ b/tools/kwbimage.c @@ -1745,7 +1745,7 @@ static int kwbimage_verify_header(unsigned char *ptr, int image_size, return -FDT_ERR_BADSTRUCTURE; size = le32_to_cpu(mhdr->blocksize); - if (offset + size > image_size || size % 4 != 0) + if (size < 4 || offset + size > image_size || size % 4 != 0) return -FDT_ERR_BADSTRUCTURE; if (image_checksum32(ptr + offset, size - 4) !=