40 lines
872 B
Diff
40 lines
872 B
Diff
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From 491e3acc55d7a54e2588de476733e93c4c7ffea0 Mon Sep 17 00:00:00 2001
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From: Young_X <YangX92@hotmail.com>
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Date: Sat, 8 Sep 2018 14:46:27 +0800
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Subject: [PATCH] avoid potential int32 overflows in multiply_ms()
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---
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tools/ppm2tiff.c | 13 +++++++------
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1 file changed, 7 insertions(+), 6 deletions(-)
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diff --git a/tools/ppm2tiff.c b/tools/ppm2tiff.c
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index 91415e9..81ffa3d 100644
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--- a/tools/ppm2tiff.c
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+++ b/tools/ppm2tiff.c
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@@ -72,15 +72,16 @@ BadPPM(char* file)
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exit(-2);
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}
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+
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+#define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0))
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+#define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1)
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+
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static tmsize_t
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multiply_ms(tmsize_t m1, tmsize_t m2)
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{
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- tmsize_t bytes = m1 * m2;
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-
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- if (m1 && bytes / m1 != m2)
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- bytes = 0;
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-
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- return bytes;
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+ if( m1 == 0 || m2 > TIFF_TMSIZE_T_MAX / m1 )
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+ return 0;
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+ return m1 * m2;
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}
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int
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--
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2.17.2
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