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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Wed, 21 Oct 2020 14:41:27 +0000
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Subject: [PATCH] gnulib/regexec: Resolve unused variable
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This is a really minor issue where a variable is being assigned to but
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not checked before it is overwritten again.
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The reason for this issue is that we are not building with DEBUG set and
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this in turn means that the assert() that reads the value of the
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variable match_last is being processed out.
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The solution, move the assignment to match_last in to an ifdef DEBUG too.
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Fixes: CID 292459
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/gnulib/regexec.c | 4 ++++
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conf/Makefile.extra-dist | 1 +
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grub-core/gnulib-fix-unused-value.patch | 14 ++++++++++++++
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3 files changed, 19 insertions(+)
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create mode 100644 grub-core/gnulib-fix-unused-value.patch
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diff --git a/grub-core/gnulib/regexec.c b/grub-core/gnulib/regexec.c
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index a7776f088..9264f2628 100644
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--- a/grub-core/gnulib/regexec.c
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+++ b/grub-core/gnulib/regexec.c
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@@ -879,7 +879,11 @@ re_search_internal (const regex_t *preg,
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break;
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if (BE (err != REG_NOMATCH, 0))
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goto free_return;
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+#ifdef DEBUG
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+ /* Only used for assertion below when DEBUG is set, otherwise
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+ it will be over-written when we loop around. */
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match_last = REG_MISSING;
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+#endif
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}
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else
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break; /* We found a match. */
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diff --git a/conf/Makefile.extra-dist b/conf/Makefile.extra-dist
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index 5946ec24a..b53fe6dfd 100644
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--- a/conf/Makefile.extra-dist
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+++ b/conf/Makefile.extra-dist
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@@ -31,6 +31,7 @@ EXTRA_DIST += grub-core/genemuinit.sh
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EXTRA_DIST += grub-core/genemuinitheader.sh
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EXTRA_DIST += grub-core/gnulib-fix-null-deref.diff
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+EXTRA_DIST += grub-core/gnulib-fix-unused-value.patch
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EXTRA_DIST += grub-core/gnulib-fix-width.diff
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EXTRA_DIST += grub-core/gnulib-no-abort.diff
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EXTRA_DIST += grub-core/gnulib-no-gets.diff
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diff --git a/grub-core/gnulib-fix-unused-value.patch b/grub-core/gnulib-fix-unused-value.patch
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new file mode 100644
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index 000000000..452a87329
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--- /dev/null
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+++ b/grub-core/gnulib-fix-unused-value.patch
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@@ -0,0 +1,14 @@
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+--- grub-core/gnulib/regexec.c 2020-10-21 14:25:35.310195912 +0000
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++++ grub-core/gnulib/regexec.c 2020-10-21 14:32:07.961765604 +0000
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+@@ -828,7 +828,11 @@
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+ break;
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+ if (BE (err != REG_NOMATCH, 0))
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+ goto free_return;
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++#ifdef DEBUG
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++ /* Only used for assertion below when DEBUG is set, otherwise
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++ it will be over-written when we loop around. */
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+ match_last = REG_MISSING;
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++#endif
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+ }
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+ else
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+ break; /* We found a match. */
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