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grub2/SOURCES/0396-gnulib-regexec-Fix-pos...

66 lines
2.5 KiB

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Thu, 5 Nov 2020 10:57:14 +0000
Subject: [PATCH] gnulib/regexec: Fix possible null-dereference
It appears to be possible that the mctx->state_log field may be NULL,
and the name of this function, clean_state_log_if_needed(), suggests
that it should be checking that it is valid to be cleaned before
assuming that it does.
Fixes: CID 86720
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
grub-core/gnulib/regexec.c | 3 +++
conf/Makefile.extra-dist | 1 +
grub-core/gnulib-fix-regexec-null-deref.patch | 12 ++++++++++++
3 files changed, 16 insertions(+)
create mode 100644 grub-core/gnulib-fix-regexec-null-deref.patch
diff --git a/grub-core/gnulib/regexec.c b/grub-core/gnulib/regexec.c
index 9264f2628..fdacff12c 100644
--- a/grub-core/gnulib/regexec.c
+++ b/grub-core/gnulib/regexec.c
@@ -1754,6 +1754,9 @@ clean_state_log_if_needed (re_match_context_t *mctx, Idx next_state_log_idx)
{
Idx top = mctx->state_log_top;
+ if (mctx->state_log == NULL)
+ return REG_NOERROR;
+
if ((next_state_log_idx >= mctx->input.bufs_len
&& mctx->input.bufs_len < mctx->input.len)
|| (next_state_log_idx >= mctx->input.valid_len
diff --git a/conf/Makefile.extra-dist b/conf/Makefile.extra-dist
index 06606de8d..edbe7846e 100644
--- a/conf/Makefile.extra-dist
+++ b/conf/Makefile.extra-dist
@@ -32,6 +32,7 @@ EXTRA_DIST += grub-core/genemuinitheader.sh
EXTRA_DIST += grub-core/gnulib-fix-null-deref.diff
EXTRA_DIST += grub-core/gnulib-fix-null-state-deref.patch
+EXTRA_DIST += grub-core/gnulib-fix-regexec-null-deref.patch
EXTRA_DIST += grub-core/gnulib-fix-uninit-structure.patch
EXTRA_DIST += grub-core/gnulib-fix-unused-value.patch
EXTRA_DIST += grub-core/gnulib-fix-width.diff
diff --git a/grub-core/gnulib-fix-regexec-null-deref.patch b/grub-core/gnulib-fix-regexec-null-deref.patch
new file mode 100644
index 000000000..db6dac9c9
--- /dev/null
+++ b/grub-core/gnulib-fix-regexec-null-deref.patch
@@ -0,0 +1,12 @@
+--- a/lib/regexec.c 2020-10-21 14:25:35.310195912 +0000
++++ b/lib/regexec.c 2020-11-05 10:55:09.621542984 +0000
+@@ -1692,6 +1692,9 @@
+ {
+ Idx top = mctx->state_log_top;
+
++ if (mctx->state_log == NULL)
++ return REG_NOERROR;
++
+ if ((next_state_log_idx >= mctx->input.bufs_len
+ && mctx->input.bufs_len < mctx->input.len)
+ || (next_state_log_idx >= mctx->input.valid_len