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commit 42132c543358cee9f7c3e9e9b15bb6c1063a608e
Author: Erik de Castro Lopo <erikd@mega-nerd.com>
Date: Tue Jan 1 20:11:46 2019 +1100
src/wav.c: Fix heap read overflow
This is CVE-2018-19758.
Closes: https://github.com/erikd/libsndfile/issues/435
diff --git a/src/wav.c b/src/wav.c
index 9d71aadb..5c825f2a 100644
--- a/src/wav.c
+++ b/src/wav.c
@@ -1146,6 +1146,8 @@ wav_write_header (SF_PRIVATE *psf, int calc_length)
psf_binheader_writef (psf, "44", BHW4 (0), BHW4 (0)) ; /* SMTPE format */
psf_binheader_writef (psf, "44", BHW4 (psf->instrument->loop_count), BHW4 (0)) ;
+ /* Loop count is signed 16 bit number so we limit it range to something sensible. */
+ psf->instrument->loop_count &= 0x7fff ;
for (tmp = 0 ; tmp < psf->instrument->loop_count ; tmp++)
{ int type ;
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