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X-Received-From: 2607:f8b0:4003:c06::233 Subject: [Qemu-devel] [PATCH 52/99] vnc: fix use-after-free X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-stable@nongnu.org, Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 From: Gerd Hoffmann When vnc_client_read() return value is -1 vs is not valid any more. Fixes: d49b87f0d1e0520443a990fc610d0f02bc63c556 Reported-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Gerd Hoffmann Reviewed-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Marc-Andr=C3=A9 Lureau Tested-by: Philippe Mathieu-Daud=C3=A9 Message-id: 20180420084820.3873-1-kraxel@redhat.com (cherry picked from commit 1bc3117abad28d6465ecdb2c944b22943df0e4f3) Signed-off-by: Michael Roth --- ui/vnc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/ui/vnc.c b/ui/vnc.c index e164eb798c..5526e54f48 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -1539,13 +1539,14 @@ gboolean vnc_client_io(QIOChannel *ioc G_GNUC_UNUSE= D, VncState *vs =3D opaque; if (condition & G_IO_IN) { if (vnc_client_read(vs) < 0) { - goto end; + /* vs is free()ed here */ + return TRUE; } } if (condition & G_IO_OUT) { vnc_client_write(vs); } -end: + if (vs->disconnecting) { if (vs->ioc_tag !=3D 0) { g_source_remove(vs->ioc_tag); --=20 2.17.1