From 85c877d5072866aadbe8ed0c3e0590fbb5e16788 Mon Sep 17 00:00:00 2001
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From: Fabian Greffrath <fabian@greffrath.com>
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Date: Thu, 28 Sep 2017 12:15:04 +0200
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Subject: [PATCH] double64_init: Check psf->sf.channels against upper bound
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This prevents division by zero later in the code.
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While the trivial case to catch this (i.e. sf.channels < 1) has already
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been covered, a crafted file may report a number of channels that is
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so high (i.e. > INT_MAX/sizeof(double)) that it "somehow" gets
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miscalculated to zero (if this makes sense) in the determination of the
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blockwidth. Since we only support a limited number of channels anyway,
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make sure to check here as well.
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CVE: CVE-2017-14634
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Closes: https://github.com/erikd/libsndfile/issues/318
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Upstream-Status: Backport [https://github.com/erikd/libsndfile/commit/85c877d5072866aadbe8ed0c3e0590fbb5e16788]
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Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
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Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
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---
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src/double64.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/double64.c b/src/double64.c
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index b318ea8..78dfef7 100644
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--- a/src/double64.c
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+++ b/src/double64.c
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@@ -91,7 +91,7 @@ int
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double64_init (SF_PRIVATE *psf)
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{ static int double64_caps ;
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- if (psf->sf.channels < 1)
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+ if (psf->sf.channels < 1 || psf->sf.channels > SF_MAX_CHANNELS)
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{ psf_log_printf (psf, "double64_init : internal error : channels = %d\n", psf->sf.channels) ;
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return SFE_INTERNAL ;
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} ;
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--
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2.13.3
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