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Iglesias" , =?utf-8?q?Marc-Andr=C3=A9_L?= =?utf-8?q?ureau?= , Paolo Bonzini , xen-devel@lists.xenproject.org Subject: [PATCH 1/2] xen/console: fix error handling in xen_console_device_create() Date: Tue, 7 Jan 2025 10:31:39 +0100 Message-ID: <20250107093140.86180-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20250107093140.86180-1-roger.pau@citrix.com> References: <20250107093140.86180-1-roger.pau@citrix.com> MIME-Version: 1.0 The usage of error_prepend() in some of the error contexts of xen_console_device_create() is incorrect, as `errp` hasn't been initialized. This leads to the following segmentation fault on error paths resulting from xenstore reads: Program terminated with signal SIGSEGV, Segmentation fault. Address not mapped to object. fmt=0x15c4dfeade42 "failed to read console device type: ", ap=0x15cd0165ab50) at ../qemu-xen-dir-remote/util/error.c:142 142 g_string_append(newmsg, (*errp)->msg); [...] (gdb) bt (errp=0x15cd0165ae10, fmt=0x15c4dfeade42 "failed to read console device type: ", ap=0x15cd0165ab50) at ../qemu-xen-dir-remote/util/error.c:142 (errp=0x15cd0165ae10, fmt=0x15c4dfeade42 "failed to read console device type: ") at ../qemu-xen-dir-remote/util/error.c:152 (backend=0x43944de00660, opts=0x43944c929000, errp=0x15cd0165ae10) at ../qemu-xen-dir-remote/hw/char/xen_console.c:555 Replace usages of error_prepend() with error_setg() where appropriate. Fixes: 9b7737469080 ('hw/xen: update Xen console to XenDevice model') Signed-off-by: Roger Pau Monné --- Cc: Stefano Stabellini Cc: Anthony PERARD Cc: Paul Durrant Cc: "Edgar E. Iglesias" Cc: "Marc-André Lureau" Cc: Paolo Bonzini Cc: xen-devel@lists.xenproject.org --- hw/char/xen_console.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c index ef0c2912efa1..af706c7ef440 100644 --- a/hw/char/xen_console.c +++ b/hw/char/xen_console.c @@ -551,7 +551,7 @@ static void xen_console_device_create(XenBackendInstance *backend, } if (xs_node_scanf(xsh, XBT_NULL, fe, "type", errp, "%ms", &type) != 1) { - error_prepend(errp, "failed to read console device type: "); + error_setg(errp, "failed to read console device type: "); goto fail; } @@ -582,7 +582,7 @@ static void xen_console_device_create(XenBackendInstance *backend, } else if (number) { cd = serial_hd(number); if (!cd) { - error_prepend(errp, "console: No serial device #%ld found: ", + error_setg(errp, "console: No serial device #%ld found: ", number); goto fail; }