From 2cdd31f8f4b6b4b24d13428378e225caa7aa8c70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sigrid=20Solveig=20Hafl=C3=ADnud=C3=B3ttir?=
 <ftrvxmtrx@gmail.com>
Date: Wed, 30 Mar 2022 20:51:03 +0000
Subject: [PATCH] libtags: wav: do not div by zero

---
 sys/src/cmd/audio/libtags/wav.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/src/cmd/audio/libtags/wav.c b/sys/src/cmd/audio/libtags/wav.c
index a016a1224..4b284faeb 100644
--- a/sys/src/cmd/audio/libtags/wav.c
+++ b/sys/src/cmd/audio/libtags/wav.c
@@ -59,6 +59,8 @@ tagwav(Tagctx *ctx)
 			csz -= 16;
 			ctx->channels = le16u(d+2);
 			ctx->samplerate = leuint(d+4);
+			if(ctx->channels < 1 || ctx->samplerate < 1)
+				return -1;
 			ctx->duration = sz*1000 / leuint(d+8);
 		}else if(memcmp(d, "LIST", 4) == 0){
 			sz = csz - 4;