There is a heap-based buffer over-read at wav.c in wav_write_header in
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libsndfile 1.0.28 that will cause a denial of service.
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CVE: CVE-2018-19758
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Upstream-Status: Backport [42132c543358cee9f7c3e9e9b15bb6c1063a608e]
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Signed-off-by: Ross Burton <ross.burton@intel.com>
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From c12173b0197dd0c5cfa2cd27977e982d2ae59486 Mon Sep 17 00:00:00 2001
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From: Erik de Castro Lopo <erikd@mega-nerd.com>
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Date: Tue, 1 Jan 2019 20:11:46 +1100
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Subject: [PATCH] src/wav.c: Fix heap read overflow
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This is CVE-2018-19758.
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Closes: https://github.com/erikd/libsndfile/issues/435
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---
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src/wav.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/src/wav.c b/src/wav.c
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index e8405b55..6fb94ae8 100644
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--- a/src/wav.c
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+++ b/src/wav.c
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@@ -1094,6 +1094,8 @@ wav_write_header (SF_PRIVATE *psf, int calc_length)
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psf_binheader_writef (psf, "44", 0, 0) ; /* SMTPE format */
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psf_binheader_writef (psf, "44", psf->instrument->loop_count, 0) ;
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+ /* Loop count is signed 16 bit number so we limit it range to something sensible. */
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+ psf->instrument->loop_count &= 0x7fff ;
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for (tmp = 0 ; tmp < psf->instrument->loop_count ; tmp++)
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{ int type ;
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--
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2.11.0
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