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Date: Mon, 15 Aug 2022 19:54:33 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Hsin-Yi Wang <hsinyi@...omium.org>, AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Ulf Hansson <ulf.hansson@...aro.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.18 0274/1095] PM: domains: Ensure genpd_debugfs_dir exists before remove From: Hsin-Yi Wang <hsinyi@...omium.org> [ Upstream commit 37101d3c719386040ded735a5ec06974f1d94d1f ] Both genpd_debug_add() and genpd_debug_remove() may be called indirectly by other drivers while genpd_debugfs_dir is not yet set. For example, drivers can call pm_genpd_init() in probe or pm_genpd_init() in probe fail/cleanup path: pm_genpd_init() --> genpd_debug_add() pm_genpd_remove() --> genpd_remove() --> genpd_debug_remove() At this time, genpd_debug_init() may not yet be called. genpd_debug_add() checks that if genpd_debugfs_dir is NULL, it will return directly. Make sure this is also checked in pm_genpd_remove(), otherwise components under debugfs root which has the same name as other components under pm_genpd may be accidentally removed, since NULL represents debugfs root. Fixes: 718072ceb211 ("PM: domains: create debugfs nodes when adding power domains") Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/base/power/domain.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index f0e4b0ea93e8..59a706a126e5 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -219,6 +219,9 @@ static void genpd_debug_remove(struct generic_pm_domain *genpd) { struct dentry *d; + if (!genpd_debugfs_dir) + return; + d = debugfs_lookup(genpd->name, genpd_debugfs_dir); debugfs_remove(d); } -- 2.35.1
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