From: Alan Cox <alan@linux.intel.com>
Date: Thu, 4 Jun 2015 10:43:14 +0000 (+0100)
Subject: readi: Fix sign handling problems
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=fa58fc10bb5e823fc5109d9fc27feadaba6be2e7;p=FUZIX.git

readi: Fix sign handling problems

We are permitted to write from beyond EOF, but a read from beyond EOF must
return 0
---

diff --git a/Kernel/inode.c b/Kernel/inode.c
index c7c3b574..d7bfabb6 100644
--- a/Kernel/inode.c
+++ b/Kernel/inode.c
@@ -26,9 +26,12 @@ void readi(inoptr ino, uint8_t flag)
 	case F_REG:
 
 		/* See if end of file will limit read */
-
-		udata.u_count = min(udata.u_count,
+		if (ino->c_node.i_size <= udata.u_offset)
+			udata.u_count = 0;
+                else {
+			udata.u_count = min(udata.u_count,
 				ino->c_node.i_size - udata.u_offset);
+                }
 		toread = udata.u_count;
 		goto loop;