From 0c77123eeeadae9e8a02461d1fb4d023fbf3aa47 Mon Sep 17 00:00:00 2001
From: Roy Kupershmid <roy.kuper13@gmail.com>
Date: Sat, 31 Aug 2019 16:57:56 +0300
Subject: [PATCH] lfs: Validate lfs-cfg sizes before performing arithmetic
 logics with them

---
 lfs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lfs.c b/lfs.c
index b10c186..e6ad1c3 100644
--- a/lfs.c
+++ b/lfs.c
@@ -3369,6 +3369,12 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
     lfs->cfg = cfg;
     int err = 0;
 
+    // validate that the lfs-cfg sizes were initiated properly before
+    // performing any arithmetic logics with them
+    LFS_ASSERT(lfs->cfg->read_size != 0);
+    LFS_ASSERT(lfs->cfg->prog_size != 0);
+    LFS_ASSERT(lfs->cfg->cache_size != 0);
+
     // check that block size is a multiple of cache size is a multiple
     // of prog and read sizes
     LFS_ASSERT(lfs->cfg->cache_size % lfs->cfg->read_size == 0);