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From 399719595f413158b3510128eb85f944654f960c Mon Sep 17 00:00:00 2001
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From: DRC <information@libjpeg-turbo.org>
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Date: Tue, 12 Jun 2018 20:27:00 -0500
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Subject: [PATCH] tjLoadImage(): Fix FPE triggered by malformed BMP
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In rdbmp.c, it is necessary to guard against 32-bit overflow/wraparound
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when allocating the row buffer, because since BMP files have 32-bit
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width and height fields, the value of biWidth can be up to 4294967295.
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Specifically, if biWidth is 1073741824 and cinfo->input_components = 4,
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then the samplesperrow argument in alloc_sarray() would wrap around to
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0, and a division by zero error would occur at line 458 in jmemmgr.c.
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If biWidth is set to a higher value, then samplesperrow would wrap
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around to a small number, which would likely cause a buffer overflow
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(this has not been tested or verified.)
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---
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rdbmp.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/rdbmp.c b/rdbmp.c
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index eaa7086..4104b68 100644
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--- a/rdbmp.c
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+++ b/rdbmp.c
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@@ -434,6 +434,12 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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progress->total_extra_passes++; /* count file input as separate pass */
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}
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+ /* Ensure that biWidth * cinfo->input_components doesn't exceed the maximum
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+ value of the JDIMENSION type. This is only a danger with BMP files, since
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+ their width and height fields are 32-bit integers. */
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+ if ((unsigned long long)biWidth *
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+ (unsigned long long)cinfo->input_components > 0xFFFFFFFFULL)
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+ ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
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/* Allocate one-row buffer for returned data */
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source->pub.buffer = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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--
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2.17.1
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