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drm/tegra: Check syncpoint ID in the 'submit' IOCTL 

In case of invalid syncpoint ID, the host1x_syncpt_get() returns NULL and
none of its users perform a check of the returned pointer later. Let's bail
out until it's too late.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2017-06-15 02:18:28 +03:00 committed by Thierry Reding
parent d0fbbdff2e
commit e0b2ce0210
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/tegra/drm.c
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@ -393,6 +393,8 @@ int tegra_drm_submit(struct tegra_drm_context *context,
struct drm_tegra_waitchk __user *waitchks =
(void __user *)(uintptr_t)args->waitchks;
struct drm_tegra_syncpt syncpt;
struct host1x *host1x = dev_get_drvdata(drm->dev->parent);
struct host1x_syncpt *sp;
struct host1x_job *job;
int err;
@ -522,6 +524,13 @@ int tegra_drm_submit(struct tegra_drm_context *context,
goto fail;
}
/* check whether syncpoint ID is valid */
sp = host1x_syncpt_get(host1x, syncpt.id);
if (!sp) {
err = -ENOENT;
goto fail;
}
job->is_addr_reg = context->client->ops->is_addr_reg;
job->syncpt_incrs = syncpt.incrs;
job->syncpt_id = syncpt.id;