From d64ba87edae62894ca74cfb9d6d8cdd88c213397 Mon Sep 17 00:00:00 2001
From: Paul LeoNerd Evans <leonerd@leonerd.org.uk>
Date: Wed, 18 Jan 2012 10:36:50 +0000
Subject: Ensure that termkey_advisereadable() just fails with errno=ENOMEM
 rather than trying to read() zero bytes

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

(limited to 'termkey.c')

diff --git a/termkey.c b/termkey.c
index 7770d83..a55b106 100644
--- a/termkey.c
+++ b/termkey.c
@@ -949,6 +949,12 @@ TermKeyResult termkey_advisereadable(TermKey *tk)
     tk->buffstart = 0;
   }
 
+  /* Not expecting it ever to be greater but doesn't hurt to handle that */
+  if(tk->buffcount >= tk->buffsize) {
+    errno = ENOMEM;
+    return TERMKEY_RES_ERROR;
+  }
+
 retry:
   len = read(tk->fd, tk->buffer + tk->buffcount, tk->buffsize - tk->buffcount);
 
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