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hw/virtio/vhost-user: avoid using unitialized errp 

During protocol negotiation, when we the QEMU
stub does not support a backend with F_CONFIG,
it throws a warning and supresses the
VHOST_USER_PROTOCOL_F_CONFIG bit.

However, the warning uses warn_reportf_err macro
and passes an unitialized errp pointer. However,
the macro tries to edit the 'msg' member of the
unitialized Error and segfaults.

Instead, just use warn_report, which prints a
warning message directly to the output.

Fixes: 5653493 ("hw/virtio/vhost-user: don't suppress F_CONFIG when supported")
Signed-off-by: Albert Esteve <aesteve@redhat.com>
Message-Id: <20230302121719.9390-1-aesteve@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Albert Esteve 2023-03-02 13:17:19 +01:00 committed by Michael S. Tsirkin
parent 154070eaf6
commit 90e31232cf
1 changed files with 2 additions and 2 deletions
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4
hw/virtio/vhost-user.c
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@ -2031,8 +2031,8 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque,
} else {
if (virtio_has_feature(protocol_features,
VHOST_USER_PROTOCOL_F_CONFIG)) {
warn_reportf_err(*errp, "vhost-user backend supports "
"VHOST_USER_PROTOCOL_F_CONFIG but QEMU does not.");
warn_report("vhost-user backend supports "
"VHOST_USER_PROTOCOL_F_CONFIG but QEMU does not.");
protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
}
}