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accel/ivpu: Disallow re-exporting imported GEM objects

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Prevent re-exporting of imported GEM buffers by adding a custom
prime_handle_to_fd callback that checks if the object is imported
and returns -EOPNOTSUPP if so.

Re-exporting imported GEM buffers causes loss of buffer flags settings,
leading to incorrect device access and data corruption.

Reported-by: Yametsu <yam3tsu@gmail.com>
Fixes: 57557964b5 ("accel/ivpu: Add support for userptr buffer objects")
Reviewed-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Cc: <stable@vger.kernel.org> # v6.19+
This commit is contained in:
Karol Wachowski
2026-04-30 11:56:44 +02:00
parent ac2c996675
commit 7dd57d7a63
1 changed files with 21 additions and 0 deletions
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21
drivers/accel/ivpu/ivpu_drv.c
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@@ -537,6 +537,26 @@ static const struct file_operations ivpu_fops = {
#endif
};
static int ivpu_gem_prime_handle_to_fd(struct drm_device *dev, struct drm_file *file_priv,
u32 handle, u32 flags, int *prime_fd)
{
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(file_priv, handle);
if (!obj)
return -ENOENT;
if (drm_gem_is_imported(obj)) {
/* Do not allow re-exporting */
drm_gem_object_put(obj);
return -EOPNOTSUPP;
}
drm_gem_object_put(obj);
return drm_gem_prime_handle_to_fd(dev, file_priv, handle, flags, prime_fd);
}
static const struct drm_driver driver = {
.driver_features = DRIVER_GEM | DRIVER_COMPUTE_ACCEL,
@@ -545,6 +565,7 @@ static const struct drm_driver driver = {
.gem_create_object = ivpu_gem_create_object,
.gem_prime_import = ivpu_gem_prime_import,
.prime_handle_to_fd = ivpu_gem_prime_handle_to_fd,
.ioctls = ivpu_drm_ioctls,
.num_ioctls = ARRAY_SIZE(ivpu_drm_ioctls),