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From 7b6a889217d62ed7e28188621403cc7542fd1f7e Mon Sep 17 00:00:00 2001
From: Mans Rullgard <mans@mansr.com>
Date: Tue, 4 Feb 2020 12:55:18 +0000
Subject: [PATCH] sox-fmt: validate comments_bytes before use (CVE-2019-13590)
[bug #325]
Cap the comments size to 1 GB to avoid overflows in subsequent
arithmetic.
The missing null check mentioned in the bug report is bogus since
lsx_calloc() returns a valid pointer or aborts.
---
src/sox-fmt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/sox-fmt.c b/src/sox-fmt.c
index aad965cd..11c88771 100644
--- a/src/sox-fmt.c
+++ b/src/sox-fmt.c
@@ -46,7 +46,9 @@ static int startread(sox_format_t * ft)
lsx_readdw(ft, &comments_bytes))
return SOX_EOF;
- if (((headers_bytes + 4) & 7) || headers_bytes < FIXED_HDR + comments_bytes ||
+ if (((headers_bytes + 4) & 7) ||
+ comments_bytes > 0x40000000 || /* max 1 GB */
+ headers_bytes < FIXED_HDR + comments_bytes ||
(num_channels > 65535)) /* Reserve top 16 bits */ {
lsx_fail_errno(ft, SOX_EHDR, "invalid sox file format header");
return SOX_EOF;
--
2.25.0
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