From 9899c7fe486d4a581fb84ecf832a574896d411b7 Mon Sep 17 00:00:00 2001
From: Christopher Haster <chaster@utexas.edu>
Date: Tue, 21 May 2019 17:21:52 -0500
Subject: [PATCH] Fixed read cache amount based on hint and offset

Found by apmorton
---
 lfs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lfs.c b/lfs.c
index 7692d09..b0e6819 100644
--- a/lfs.c
+++ b/lfs.c
@@ -84,9 +84,12 @@ static int lfs_bd_read(lfs_t *lfs,
         LFS_ASSERT(block < lfs->cfg->block_count);
         rcache->block = block;
         rcache->off = lfs_aligndown(off, lfs->cfg->read_size);
-        rcache->size = lfs_min(lfs_alignup(off+hint, lfs->cfg->read_size),
-                lfs_min(lfs->cfg->block_size - rcache->off,
-                    lfs->cfg->cache_size));
+        rcache->size = lfs_min(
+                lfs_min(
+                    lfs_alignup(off+hint, lfs->cfg->read_size),
+                    lfs->cfg->block_size)
+                - rcache->off,
+                lfs->cfg->cache_size);
         int err = lfs->cfg->read(lfs->cfg, rcache->block,
                 rcache->off, rcache->buffer, rcache->size);
         if (err) {