bluez: fix CVE-2021-3588

The cli_feat_read_cb() function in src/gatt-database.c does not perform
bounds checks on the 'offset' variable before using it as an index into
an array for reading

https://nvd.nist.gov/vuln/detail/CVE-2021-3588

(From OE-Core rev: 569362f338736a1c85f090909a9893d019bfce5d)

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/bluez5/bluez5.inc b/meta/recipes-connectivity/bluez5/bluez5.inc
index f34ba0dce5..202a14dee0 100644
--- a/meta/recipes-connectivity/bluez5/bluez5.inc
+++ b/meta/recipes-connectivity/bluez5/bluez5.inc
@@ -52,6 +52,7 @@ SRC_URI = "${KERNELORG_MIRROR}/linux/bluetooth/bluez-${PV}.tar.xz \
            ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', '', 'file://0001-Allow-using-obexd-without-systemd-in-the-user-sessio.patch', d)} \
            file://0001-tests-add-a-target-for-building-tests-without-runnin.patch \
            file://0001-test-gatt-Fix-hung-issue.patch \
+           file://CVE-2021-3588.patch \
            "
 S = "${WORKDIR}/bluez-${PV}"
 
diff --git a/meta/recipes-connectivity/bluez5/bluez5/CVE-2021-3588.patch b/meta/recipes-connectivity/bluez5/bluez5/CVE-2021-3588.patch
new file mode 100644
index 0000000000..f52ff47a06
--- /dev/null
+++ b/meta/recipes-connectivity/bluez5/bluez5/CVE-2021-3588.patch
@@ -0,0 +1,34 @@
+From 3a40bef49305f8327635b81ac8be52a3ca063d5a Mon Sep 17 00:00:00 2001
+From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
+Date: Mon, 4 Jan 2021 10:38:31 -0800
+Subject: [PATCH] gatt: Fix potential buffer out-of-bound
+
+When client features is read check if the offset is within the cli_feat
+bounds.
+
+Fixes: https://github.com/bluez/bluez/issues/70
+
++Upstream-Status: Backport [https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=3a40bef49305f8327635b81ac8be52a3ca063d5a]
++Signed-off-by: Steve Sakoman <steve@sakoman.com>
++CVE: CVE-2021-3588
+
+---
+ src/gatt-database.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/gatt-database.c b/src/gatt-database.c
+index 90cc4bade..f2d7b5821 100644
+--- a/src/gatt-database.c
++++ b/src/gatt-database.c
+@@ -1075,6 +1075,11 @@ static void cli_feat_read_cb(struct gatt_db_attribute *attrib,
+                goto done;
+        }
+ 
++       if (offset >= sizeof(state->cli_feat)) {
++               ecode = BT_ATT_ERROR_INVALID_OFFSET;
++               goto done;
++       }
++
+        len = sizeof(state->cli_feat) - offset;
+        value = len ? &state->cli_feat[offset] : NULL;
+