Blame SOURCES/0186-Fix-security-issue-when-reading-username-and-passwor.patch

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From 3afaf579fb89ee4e1f6fc53f950e8ec574a9489a Mon Sep 17 00:00:00 2001
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From: Hector Marco-Gisbert <hecmargi@upv.es>
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Date: Fri, 13 Nov 2015 16:21:09 +0100
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Subject: [PATCH 186/198] Fix security issue when reading username and password
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  This patch fixes two integer underflows at:
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    * grub-core/lib/crypto.c
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    * grub-core/normal/auth.c
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Resolves: CVE-2015-8370
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Signed-off-by: Hector Marco-Gisbert <hecmargi@upv.es>
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Signed-off-by: Ismael Ripoll-Ripoll <iripoll@disca.upv.es>
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---
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 grub-core/lib/crypto.c  | 2 +-
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 grub-core/normal/auth.c | 2 +-
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 2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/grub-core/lib/crypto.c b/grub-core/lib/crypto.c
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index 8e8426c..a23519c 100644
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--- a/grub-core/lib/crypto.c
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+++ b/grub-core/lib/crypto.c
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@@ -456,7 +456,7 @@ grub_password_get (char buf[], unsigned buf_size)
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 	  break;
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 	}
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-      if (key == '\b')
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+      if (key == '\b' && cur_len)
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 	{
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 	  cur_len--;
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 	  continue;
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diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c
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index c6bd96e..5782ec5 100644
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--- a/grub-core/normal/auth.c
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+++ b/grub-core/normal/auth.c
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@@ -172,7 +172,7 @@ grub_username_get (char buf[], unsigned buf_size)
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 	  break;
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 	}
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-      if (key == '\b')
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+      if (key == '\b' && cur_len)
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 	{
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 	  cur_len--;
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 	  grub_printf ("\b");
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-- 
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2.7.4
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