go: fix CVE-2019-17596

https://github.com/golang/go/commit/2017d88dbc096381d4f348d2fb08bfb3c2b7ed73

(From OE-Core rev: 581de91fcf73675f638e7b739dd99291baf36f50)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 43 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.12.inc b/meta/recipes-devtools/go/go-1.12.inc
index ed14b175e6..6aecaad75d 100644
--- a/meta/recipes-devtools/go/go-1.12.inc
+++ b/meta/recipes-devtools/go/go-1.12.inc
@@ -17,6 +17,7 @@ SRC_URI += "\
     file://0007-cmd-go-make-GOROOT-precious-by-default.patch \
     file://0008-use-GOBUILDMODE-to-set-buildmode.patch \
     file://0001-release-branch.go1.12-security-net-textproto-don-t-n.patch \
+    file://0010-fix-CVE-2019-17596.patch \
 "
 SRC_URI_append_libc-musl = " file://0009-ld-replace-glibc-dynamic-linker-with-musl.patch"
 
diff --git a/meta/recipes-devtools/go/go-1.12/0010-fix-CVE-2019-17596.patch b/meta/recipes-devtools/go/go-1.12/0010-fix-CVE-2019-17596.patch
new file mode 100644
index 0000000000..134cfab737
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.12/0010-fix-CVE-2019-17596.patch
@@ -0,0 +1,42 @@
+From f1783e1ce44a86c000a7c380a57a805c89c3efbe Mon Sep 17 00:00:00 2001
+From: Katie Hockman <katie@golang.org>
+Date: Mon, 14 Oct 2019 16:42:21 -0400
+Subject: [PATCH] crypto/dsa: prevent bad public keys from causing panic
+
+dsa.Verify might currently use a nil s inverse in a
+multiplication if the public key contains a non-prime Q,
+causing a panic. Change this to check that the mod
+inverse exists before using it.
+
+Fixes CVE-2019-17596
+
+Change-Id: I94d5f3cc38f1b5d52d38dcb1d253c71b7fd1cae7
+Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/572809
+Reviewed-by: Filippo Valsorda <valsorda@google.com>
+(cherry picked from commit 9119dfb0511326d4485b248b83d4fde19c95d0f7)
+Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/575232
+
+CVE: CVE-2019-17596
+Upstream-Status: Backport [https://github.com/golang/go/commit/2017d88dbc096381d4f348d2fb08bfb3c2b7ed73]
+Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
+---
+ src/crypto/dsa/dsa.go | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/crypto/dsa/dsa.go b/src/crypto/dsa/dsa.go
+index 575314b..2fc4f1f 100644
+--- a/src/crypto/dsa/dsa.go
++++ b/src/crypto/dsa/dsa.go
+@@ -279,6 +279,9 @@ func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool {
+        }
+ 
+        w := new(big.Int).ModInverse(s, pub.Q)
++       if w == nil {
++               return false
++       }
+ 
+        n := pub.Q.BitLen()
+        if n&7 != 0 {
+-- 
+2.23.0
+