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gnulib/regexec: Fix possible null-dereference

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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>
This commit is contained in:
Darren Kenny authored and Daniel Kiper committed 2021-03-02 15:54:16 +01:00
1 parent 3a37bf120a
commit 0b7f347638
3 files changed
+15 -1
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grub-core/lib/gnulib-patches/fix-regexec-null-deref.patch
+12
View File
@@ -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