76 lines
2.7 KiB
Diff
76 lines
2.7 KiB
Diff
From 21399f6b7d318fcdf4406d5e88723c4922202aa3 Mon Sep 17 00:00:00 2001
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From: Young Xiao <YangX92@hotmail.com>
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Date: Sat, 16 Mar 2019 19:57:27 +0800
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Subject: [PATCH] convertbmp: detect invalid file dimensions early
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width/length dimensions read from bmp headers are not necessarily
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valid. For instance they may have been maliciously set to very large
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values with the intention to cause DoS (large memory allocation, stack
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overflow). In these cases we want to detect the invalid size as early
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as possible.
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This commit introduces a counter which verifies that the number of
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written bytes corresponds to the advertized width/length.
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See commit 8ee335227bbc for details.
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Signed-off-by: Young Xiao <YangX92@hotmail.com>
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Conflict:NA
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Reference:https://github.com/uclouvain/openjpeg/commit/21399f6b7d318fcdf4406d5e88723c4922202aa3
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---
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src/bin/jp2/convertbmp.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/src/bin/jp2/convertbmp.c b/src/bin/jp2/convertbmp.c
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index 8220078..c69daee 100644
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--- a/src/bin/jp2/convertbmp.c
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+++ b/src/bin/jp2/convertbmp.c
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@@ -622,13 +622,13 @@ static OPJ_BOOL bmp_read_rle8_data(FILE* IN, OPJ_UINT8* pData,
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static OPJ_BOOL bmp_read_rle4_data(FILE* IN, OPJ_UINT8* pData,
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OPJ_UINT32 stride, OPJ_UINT32 width, OPJ_UINT32 height)
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{
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- OPJ_UINT32 x, y;
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+ OPJ_UINT32 x, y, written;
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OPJ_UINT8 *pix;
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const OPJ_UINT8 *beyond;
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beyond = pData + stride * height;
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pix = pData;
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- x = y = 0U;
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+ x = y = written = 0U;
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while (y < height) {
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int c = getc(IN);
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if (c == EOF) {
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@@ -642,6 +642,7 @@ static OPJ_BOOL bmp_read_rle4_data(FILE* IN, OPJ_UINT8* pData,
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for (j = 0; (j < c) && (x < width) &&
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((OPJ_SIZE_T)pix < (OPJ_SIZE_T)beyond); j++, x++, pix++) {
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*pix = (OPJ_UINT8)((j & 1) ? (c1 & 0x0fU) : ((c1 >> 4) & 0x0fU));
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+ written++;
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}
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} else { /* absolute mode */
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c = getc(IN);
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@@ -671,6 +672,7 @@ static OPJ_BOOL bmp_read_rle4_data(FILE* IN, OPJ_UINT8* pData,
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c1 = (OPJ_UINT8)getc(IN);
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}
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*pix = (OPJ_UINT8)((j & 1) ? (c1 & 0x0fU) : ((c1 >> 4) & 0x0fU));
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+ written++;
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}
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if (((c & 3) == 1) || ((c & 3) == 2)) { /* skip padding byte */
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getc(IN);
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@@ -678,6 +680,10 @@ static OPJ_BOOL bmp_read_rle4_data(FILE* IN, OPJ_UINT8* pData,
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}
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}
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} /* while(y < height) */
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+ if (written != width * height) {
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+ fprintf(stderr, "warning, image's actual size does not match advertized one\n");
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+ return OPJ_FALSE;
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+ }
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return OPJ_TRUE;
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}
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--
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2.33.0
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