linux-kernel - Re: [PATCH] eventfs: Fix failure path in eventfs_create_events

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Message-ID: <5c277465-2da5-7a0b-3726-b5a88d515c92@quicinc.com>
Date:   Mon, 23 Oct 2023 14:50:14 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>
CC:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH] eventfs: Fix failure path in eventfs_create_events_dir()



On 10/20/2023 6:11 AM, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> The failure path of allocating ei goes to a path that dereferences ei.
> Add another label that skips over the ei dereferences to do the rest of
> the clean up.
> 
> Link: https://lore.kernel.org/all/70e7bace-561c-95f-1117-706c2c220bc@inria.fr/
> 
> Fixes: 5790b1fb3d67 ("eventfs: Remove eventfs_file and just use eventfs_inode")
> Reported-by: Julia Lawall <julia.lawall@...ia.fr>
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>

-Mukesh

> ---
>   fs/tracefs/event_inode.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
> index 9f19b6608954..1885f1f1f339 100644
> --- a/fs/tracefs/event_inode.c
> +++ b/fs/tracefs/event_inode.c
> @@ -735,7 +735,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
>   
>   	ei = kzalloc(sizeof(*ei), GFP_KERNEL);
>   	if (!ei)
> -		goto fail;
> +		goto fail_ei;
>   
>   	inode = tracefs_get_inode(dentry->d_sb);
>   	if (unlikely(!inode))
> @@ -781,6 +781,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
>    fail:
>   	kfree(ei->d_children);
>   	kfree(ei);
> + fail_ei:
>   	tracefs_failed_creating(dentry);
>   	return ERR_PTR(-ENOMEM);
>   }