qemu: fix CVE-2023-3255

VNC: infinite loop in inflate_buffer() leads to denial of service

References:
https://nvd.nist.gov/vuln/detail/CVE-2023-3255

Upstream patches:
https://gitlab.com/qemu-project/qemu/-/commit/d921fea338c1059a27ce7b75309d7a2e485f710b

(From OE-Core rev: 52711b1392ed0c5cbe4ddf70a94b21be2f4e6e58)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 65 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index d5d210194b..83959f3c68 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -95,6 +95,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://0001-hw-display-qxl-Pass-requested-buffer-size-to-qxl_phy.patch \
            file://CVE-2023-0330.patch \
            file://CVE-2023-3301.patch \
+           file://CVE-2023-3255.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2023-3255.patch b/meta/recipes-devtools/qemu/qemu/CVE-2023-3255.patch
new file mode 100644
index 0000000000..f030df111f
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2023-3255.patch
@@ -0,0 +1,64 @@
+From d921fea338c1059a27ce7b75309d7a2e485f710b Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Tue, 4 Jul 2023 10:41:22 +0200
+Subject: [PATCH] ui/vnc-clipboard: fix infinite loop in inflate_buffer
+ (CVE-2023-3255)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+A wrong exit condition may lead to an infinite loop when inflating a
+valid zlib buffer containing some extra bytes in the `inflate_buffer`
+function. The bug only occurs post-authentication. Return the buffer
+immediately if the end of the compressed data has been reached
+(Z_STREAM_END).
+
+Fixes: CVE-2023-3255
+Fixes: 0bf41cab ("ui/vnc: clipboard support")
+Reported-by: Kevin Denis <kevin.denis@synacktiv.com>
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Tested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
+Message-ID: <20230704084210.101822-1-mcascell@redhat.com>
+
+Upstream-Status: Backport [https://github.com/qemu/qemu/commit/d921fea338c1059a27ce7b75309d7a2e485f710b]
+
+CVE: CVE-2023-3255
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+
+---
+ ui/vnc-clipboard.c | 10 ++++------
+ 1 file changed, 4 insertions(+), 6 deletions(-)
+
+diff --git a/ui/vnc-clipboard.c b/ui/vnc-clipboard.c
+index 8aeadfaa21..c759be3438 100644
+--- a/ui/vnc-clipboard.c
++++ b/ui/vnc-clipboard.c
+@@ -50,8 +50,11 @@ static uint8_t *inflate_buffer(uint8_t *in, uint32_t in_len, uint32_t *size)
+         ret = inflate(&stream, Z_FINISH);
+         switch (ret) {
+         case Z_OK:
+-        case Z_STREAM_END:
+             break;
++        case Z_STREAM_END:
++            *size = stream.total_out;
++            inflateEnd(&stream);
++            return out;
+         case Z_BUF_ERROR:
+             out_len <<= 1;
+             if (out_len > (1 << 20)) {
+@@ -66,11 +69,6 @@ static uint8_t *inflate_buffer(uint8_t *in, uint32_t in_len, uint32_t *size)
+         }
+     }
+
+-    *size = stream.total_out;
+-    inflateEnd(&stream);
+-
+-    return out;
+-
+ err_end:
+     inflateEnd(&stream);
+ err:
+--
+2.40.0