From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Wed, 21 Oct 2020 14:41:27 +0000
Subject: [PATCH] gnulib/regexec: Resolve unused variable

This is a really minor issue where a variable is being assigned to but
not checked before it is overwritten again.

The reason for this issue is that we are not building with DEBUG set and
this in turn means that the assert() that reads the value of the
variable match_last is being processed out.

The solution, move the assignment to match_last in to an ifdef DEBUG too.

Fixes: CID 292459

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/gnulib/regexec.c              |  4 ++++
 conf/Makefile.extra-dist                |  1 +
 grub-core/gnulib-fix-unused-value.patch | 14 ++++++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 grub-core/gnulib-fix-unused-value.patch

diff --git a/grub-core/gnulib/regexec.c b/grub-core/gnulib/regexec.c
index a7776f088f2..9264f262893 100644
--- a/grub-core/gnulib/regexec.c
+++ b/grub-core/gnulib/regexec.c
@@ -879,7 +879,11 @@ re_search_internal (const regex_t *preg,
 		    break;
 		  if (BE (err != REG_NOMATCH, 0))
 		    goto free_return;
+#ifdef DEBUG
+		  /* Only used for assertion below when DEBUG is set, otherwise
+		     it will be over-written when we loop around.  */
 		  match_last = REG_MISSING;
+#endif
 		}
 	      else
 		break; /* We found a match.  */
diff --git a/conf/Makefile.extra-dist b/conf/Makefile.extra-dist
index 5946ec24a65..b53fe6dfdcc 100644
--- a/conf/Makefile.extra-dist
+++ b/conf/Makefile.extra-dist
@@ -31,6 +31,7 @@ EXTRA_DIST += grub-core/genemuinit.sh
 EXTRA_DIST += grub-core/genemuinitheader.sh
 
 EXTRA_DIST += grub-core/gnulib-fix-null-deref.diff
+EXTRA_DIST += grub-core/gnulib-fix-unused-value.patch
 EXTRA_DIST += grub-core/gnulib-fix-width.diff
 EXTRA_DIST += grub-core/gnulib-no-abort.diff
 EXTRA_DIST += grub-core/gnulib-no-gets.diff
diff --git a/grub-core/gnulib-fix-unused-value.patch b/grub-core/gnulib-fix-unused-value.patch
new file mode 100644
index 00000000000..452a8732922
--- /dev/null
+++ b/grub-core/gnulib-fix-unused-value.patch
@@ -0,0 +1,14 @@
+--- grub-core/gnulib/regexec.c	2020-10-21 14:25:35.310195912 +0000
++++ grub-core/gnulib/regexec.c	2020-10-21 14:32:07.961765604 +0000
+@@ -828,7 +828,11 @@
+ 		    break;
+		  if (BE (err != REG_NOMATCH, 0))
+ 		    goto free_return;
++#ifdef DEBUG
++		  /* Only used for assertion below when DEBUG is set, otherwise
++		     it will be over-written when we loop around.  */
+		  match_last = REG_MISSING;
++#endif
+ 		}
+ 	      else
+ 		break; /* We found a match.  */