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Revision f555befd185dc097ede887eb7b308c2e1c1369d4 authored by Jan Stancek on 12 January 2021, 23:49:21 UTC, committed by Linus Torvalds on 13 January 2021, 02:12:54 UTC 
mm: migrate: initialize err in do_migrate_pages
 
After commit 236c32eb1096 ("mm: migrate: clean up migrate_prep{_local}")',
do_migrate_pages can return uninitialized variable 'err' (which is
propagated to user-space as error) when 'from' and 'to' nodesets are
identical.  This can be reproduced with LTP migrate_pages01, which calls
migrate_pages() with same set for both old/new_nodes.

Add 'err' initialization back.

Link: https://lkml.kernel.org/r/456a021c7ef3636d7668cec9dcb4a446a4244812.1609855564.git.jstancek@redhat.com
Fixes: 236c32eb1096 ("mm: migrate: clean up migrate_prep{_local}")
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Raw File
drm_lease.h 
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright © 2017 Keith Packard <keithp@keithp.com>
 */

#ifndef _DRM_LEASE_H_
#define _DRM_LEASE_H_

struct drm_file;
struct drm_device;
struct drm_master;

struct drm_master *drm_lease_owner(struct drm_master *master);

void drm_lease_destroy(struct drm_master *lessee);

bool drm_lease_held(struct drm_file *file_priv, int id);

bool _drm_lease_held(struct drm_file *file_priv, int id);

void drm_lease_revoke(struct drm_master *master);

uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs);

int drm_mode_create_lease_ioctl(struct drm_device *dev,
				void *data, struct drm_file *file_priv);

int drm_mode_list_lessees_ioctl(struct drm_device *dev,
				void *data, struct drm_file *file_priv);

int drm_mode_get_lease_ioctl(struct drm_device *dev,
			     void *data, struct drm_file *file_priv);

int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
				void *data, struct drm_file *file_priv);

#endif /* _DRM_LEASE_H_ */
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