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From: "Pali Rohár" <pali@kernel.org>
To: Stefan Roese <sr@denx.de>
Cc: u-boot@lists.denx.de, "Marek Behún" <marek.behun@nic.cz>
Subject: [PATCH 3/4] tools: kwbimage: Verify size of image data
Date: Wed, 11 Aug 2021 10:14:16 +0200	[thread overview]
Message-ID: <20210811081417.18010-3-pali@kernel.org> (raw)
In-Reply-To: <20210811081417.18010-1-pali@kernel.org>

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>
---
 tools/kwbimage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index 84c41210e39e..5ac34ac5e9c8 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -1757,7 +1757,7 @@ 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) !=
-- 
2.20.1


  parent reply	other threads:[~2021-08-11  8:14 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11  8:14 [PATCH 1/4] tools: kwbimage: Verify supported image version Pali Rohár
2021-08-11  8:14 ` [PATCH 2/4] tools: kwbimage: Verify size of v0 image header Pali Rohár
2021-08-11 14:18   ` Stefan Roese
2021-09-01  9:08   ` Stefan Roese
2021-08-11  8:14 ` Pali Rohár [this message]
2021-08-11 14:19   ` [PATCH 3/4] tools: kwbimage: Verify size of image data Stefan Roese
2021-09-01  9:08   ` Stefan Roese
2021-08-11  8:14 ` [PATCH 4/4] tools: kwbimage: Use IBR_HDR_* constants instead of raw numbers Pali Rohár
2021-08-11 14:19   ` Stefan Roese
2021-09-01  9:08   ` Stefan Roese
2021-08-11 14:18 ` [PATCH 1/4] tools: kwbimage: Verify supported image version Stefan Roese
2021-09-01  9:07 ` Stefan Roese

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