4.9-stable review patch. If anyone has any objections, please let me know.
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From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ Upstream commit d0b1d259a4b58b21a21ea82d7174bf7ea825e9cc ]
If one 'drm_gem_handle_create()' fails, we leak somes handles and some memory.
In order to fix it: - move the 'free(bo_state)' at the end of the function so that it is also called in the eror handling path. This has the side effect to also try to free it if the first 'kcalloc' fails. This is harmless. - add a new label, err_delete_handle, in order to delete already allocated handles in error handling path - remove the now useless 'err' label
The way the code is now written will also delete the handles if the 'copy_to_user()' call fails.
Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Reviewed-by: Eric Anholt eric@anholt.net Link: http://patchwork.freedesktop.org/patch/msgid/20170512123803.1886-1-christoph... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/vc4/vc4_gem.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -110,8 +110,8 @@ vc4_get_hang_state_ioctl(struct drm_devi &handle);
if (ret) { - state->bo_count = i - 1; - goto err; + state->bo_count = i; + goto err_delete_handle; } bo_state[i].handle = handle; bo_state[i].paddr = vc4_bo->base.paddr; @@ -123,13 +123,16 @@ vc4_get_hang_state_ioctl(struct drm_devi state->bo_count * sizeof(*bo_state))) ret = -EFAULT;
- kfree(bo_state); +err_delete_handle: + if (ret) { + for (i = 0; i < state->bo_count; i++) + drm_gem_handle_delete(file_priv, bo_state[i].handle); + }
err_free: - vc4_free_hang_state(dev, kernel_state); + kfree(bo_state);
-err: return ret; }