1 files changed, 35 insertions, 0 deletions
diff --git a/backport-Fix-invalid-pointer-dereference-in-wcpcpy_chk.patch b/backport-Fix-invalid-pointer-dereference-in-wcpcpy_chk.patch
new file mode 100644
index 0000000..3594c5b
--- /dev/null
+++ b/backport-Fix-invalid-pointer-dereference-in-wcpcpy_chk.patch
@@ -0,0 +1,35 @@
+From 4ee824be757337d8444fdc320aa1ca3e4397c906 Mon Sep 17 00:00:00 2001
+From: Szabolcs Nagy <szabolcs.nagy@arm.com>
+Date: Tue, 21 Jun 2022 15:57:48 +0100
+Subject: [PATCH] Fix invalid pointer dereference in wcpcpy_chk
+
+The src pointer is const and points to a different object, so accessing
+dest via src is invalid.
+
+Reviewed-by: Florian Weimer <fweimer@redhat.com>
+---
+ debug/wcpcpy_chk.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/debug/wcpcpy_chk.c b/debug/wcpcpy_chk.c
+index 0e1d381a..16410e17 100644
+--- a/debug/wcpcpy_chk.c
++++ b/debug/wcpcpy_chk.c
+@@ -29,13 +29,12 @@ __wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
+ {
+   wchar_t *wcp = (wchar_t *) dest - 1;
+   wint_t c;
+-  const ptrdiff_t off = src - dest + 1;
+ 
+   do
+     {
+       if (__glibc_unlikely (destlen-- == 0))
+ 	__chk_fail ();
+-      c = wcp[off];
++      c = *src++;
+       *++wcp = c;
+     }
+   while (c != L'\0');
+-- 
+2.27.0
+