From a5a19a33706a68a225e6df1ca627e654619f3a84 Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Tue, 27 Oct 2020 21:57:40 -0400
Subject: dircache:  Fix a NULL pointer dereference

if idx == 0, get_idx_dcvolp() will return NULL.

Change-Id: I4eafa71bb1f77ef8c865570bf8f124cdd9326d3e
---
 firmware/common/dircache.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/firmware/common/dircache.c b/firmware/common/dircache.c
index 0cdaf1bd4a..589986911c 100644
--- a/firmware/common/dircache.c
+++ b/firmware/common/dircache.c
@@ -2612,7 +2612,8 @@ static dc_serial_t get_file_serialhash(const struct dircache_file *dcfilep)
         idx = ce->up;
     }
 
-    h = dc_hash_serialnum(get_idx_dcvolp(idx)->serialnum, h);
+    if (idx < 0)
+        h = dc_hash_serialnum(get_idx_dcvolp(idx)->serialnum, h);
 
     return h;
 }
-- 
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