* [PATCH] sched,debug: fix dentry leak in update_sched_domain_debugfs
[not found] <CGME20220711025311epcms5p874ccee18b6dd4e6a62759d0749936e61@epcms5p1>
@ 2022-07-11 3:03 ` Major Chen
2022-07-11 8:04 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: Major Chen @ 2022-07-11 3:03 UTC (permalink / raw)
To: mingo, peterz, juri.lelli, vincent.guittot, dietmar.eggemann,
rostedt, bsegall, mgorman, bristot
Cc: Hongfei Tang, linux-kernel
update_sched_domain_debugfs() uses debugfs_lookup() to find wanted dentry(which has
been created by debugfs_create_dir() before), but not call dput() to return this dentry
back. This result in dentry leak even debugfs_remove() is called.
Signed-off-by: major.chen <major.chen@samsung.com>
---
kernel/sched/debug.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index bb3d63b..4ffea2d 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -412,11 +412,14 @@ void update_sched_domain_debugfs(void)
for_each_cpu(cpu, sd_sysctl_cpus) {
struct sched_domain *sd;
- struct dentry *d_cpu;
+ struct dentry *d_cpu, *d_lookup;
char buf[32];
snprintf(buf, sizeof(buf), "cpu%d", cpu);
- debugfs_remove(debugfs_lookup(buf, sd_dentry));
+ d_lookup = debugfs_lookup(buf, sd_dentry);
+ debugfs_remove(d_lookup);
+ if (!IS_ERR_OR_NULL(d_lookup))
+ dput(d_lookup);
d_cpu = debugfs_create_dir(buf, sd_dentry);
i = 0;
--
2.7.4
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] sched,debug: fix dentry leak in update_sched_domain_debugfs
2022-07-11 3:03 ` [PATCH] sched,debug: fix dentry leak in update_sched_domain_debugfs Major Chen
@ 2022-07-11 8:04 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2022-07-11 8:04 UTC (permalink / raw)
To: Major Chen
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, bristot, Hongfei Tang, linux-kernel
On Mon, Jul 11, 2022 at 11:03:41AM +0800, Major Chen wrote:
>
> update_sched_domain_debugfs() uses debugfs_lookup() to find wanted dentry(which has
> been created by debugfs_create_dir() before), but not call dput() to return this dentry
> back. This result in dentry leak even debugfs_remove() is called.
>
> Signed-off-by: major.chen <major.chen@samsung.com>
> ---
> kernel/sched/debug.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
> index bb3d63b..4ffea2d 100644
> --- a/kernel/sched/debug.c
> +++ b/kernel/sched/debug.c
> @@ -412,11 +412,14 @@ void update_sched_domain_debugfs(void)
>
> for_each_cpu(cpu, sd_sysctl_cpus) {
> struct sched_domain *sd;
> - struct dentry *d_cpu;
> + struct dentry *d_cpu, *d_lookup;
> char buf[32];
>
> snprintf(buf, sizeof(buf), "cpu%d", cpu);
> - debugfs_remove(debugfs_lookup(buf, sd_dentry));
> + d_lookup = debugfs_lookup(buf, sd_dentry);
> + debugfs_remove(d_lookup);
> + if (!IS_ERR_OR_NULL(d_lookup))
> + dput(d_lookup);
> d_cpu = debugfs_create_dir(buf, sd_dentry);
>
> i = 0;
Please try again, while not HTML, this email is severely whitespace
mangled (there's no '\t' characters in it for one).
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <CGME20220711025311epcms5p874ccee18b6dd4e6a62759d0749936e61@epcms5p1>
2022-07-11 3:03 ` [PATCH] sched,debug: fix dentry leak in update_sched_domain_debugfs Major Chen
2022-07-11 8:04 ` Peter Zijlstra
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