Patch "drm/vc4: Fix resource leak in 'vc4_get_hang_state_ioctl()' in error handling path" has been added to the 4.9-stable tree

Patch "drm/vc4: Fix resource leak in 'vc4_get_hang_state_ioctl()' in error handling path" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/vc4: Fix resource leak in 'vc4_get_hang_state_ioctl()' in error handling path

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vc4-fix-resource-leak-in-vc4_get_hang_state_ioctl-in-error-handling-path.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Fri, 12 May 2017 14:38:03 +0200
Subject: drm/vc4: Fix resource leak in 'vc4_get_hang_state_ioctl()' in error handling path

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-christophe.jaillet@wanadoo.fr
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;
 }
 


Patches currently in stable-queue which might be from christophe.jaillet@wanadoo.fr are

queue-4.9/cpuidle-dt-add-missing-of_node_put.patch
queue-4.9/drm-vc4-fix-resource-leak-in-vc4_get_hang_state_ioctl-in-error-handling-path.patch
queue-4.9/edac-mv64x60-fix-an-error-handling-path.patch
queue-4.9/smb2-fix-share-type-handling.patch
queue-4.9/asoc-intel-sst-fix-the-return-value-of-sst_send_byte_stream_mrfld.patch