![Fabrice Fontaine](/assets/img/avatar_default.png)
It was discovered the fix for CVE-2018-19758 (libsndfile) was not complete and still allows a read beyond the limits of a buffer in wav_write_header() function in wav.c. A local attacker may use this flaw to make the application crash. Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
From 6d7ce94c020cc720a6b28719d1a7879181790008 Mon Sep 17 00:00:00 2001
|
|
From: Emilio Pozuelo Monfort <pochu27@gmail.com>
|
|
Date: Tue, 5 Mar 2019 11:27:17 +0100
|
|
Subject: [PATCH] wav_write_header: don't read past the array end
|
|
|
|
If loop_count is bigger than the array, truncate it to the array
|
|
length (and not to 32k).
|
|
|
|
CVE-2019-3832
|
|
[Retrieved from:
|
|
https://github.com/erikd/libsndfile/commit/6d7ce94c020cc720a6b28719d1a7879181790008]
|
|
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
|
|
---
|
|
src/wav.c | 6 ++++--
|
|
1 file changed, 4 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/src/wav.c b/src/wav.c
|
|
index 5c825f2a..104bd0a7 100644
|
|
--- a/src/wav.c
|
|
+++ b/src/wav.c
|
|
@@ -1146,8 +1146,10 @@ 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 ;
|
|
+ /* Make sure we don't read past the loops array end. */
|
|
+ if (psf->instrument->loop_count > ARRAY_LEN (psf->instrument->loops))
|
|
+ psf->instrument->loop_count = ARRAY_LEN (psf->instrument->loops) ;
|
|
+
|
|
for (tmp = 0 ; tmp < psf->instrument->loop_count ; tmp++)
|
|
{ int type ;
|
|
|