busybox: add attribution to patch

core/busybox/checksums

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core/busybox/patches/awk-fix-%%.patch

@@ -1,10 +1,31 @@
+
+Upstream commit:
+
+    awk: fix read beyond end of buffer
+    Commit 7d06d6e18 (awk: fix printf %%) can cause awk printf to read
+    beyond the end of a strduped buffer:
+
+      2349      while (*f && *f != '%')
+      2350          f++;
+      2351      c = *++f;
+
+    If the loop terminates because a NUL character is detected the
+    character after the NUL is read.  This can result in failures
+    depending on the value of that character.
+
+    function                                             old     new   delta
+    awk_printf                                           672     665      -7
+
+    Signed-off-by: Ron Yorston <rmy@pobox.com>
+    Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
+
 diff --git a/editors/awk.c b/editors/awk.c
 index 3adbca7..02c26d7 100644
 --- a/editors/awk.c
 +++ b/editors/awk.c
 @@ -2346,12 +2346,21 @@ static char *awk_printf(node *n, size_t *len)
  		size_t slen;
- 
+
  		s = f;
 -		while (*f && (*f != '%' || *++f == '%'))
 -			f++;