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tools: kwbimage: Verify size of image data

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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 <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár
2021-08-11 10:14:16 +02:00
committed by Stefan Roese
parent 33a0af2d80
commit a008dbaa8c
1 changed files with 1 additions and 1 deletions
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tools/kwbimage.c
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@@ -1745,7 +1745,7 @@ static int kwbimage_verify_header(unsigned char *ptr, int image_size,
return -FDT_ERR_BADSTRUCTURE; return -FDT_ERR_BADSTRUCTURE;
size = le32_to_cpu(mhdr->blocksize); 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; return -FDT_ERR_BADSTRUCTURE;
if (image_checksum32(ptr + offset, size - 4) != if (image_checksum32(ptr + offset, size - 4) !=