linux-kernel - Re: [PATCH][next] fs: Fix uninitialized scalar variable now

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Message-ID: <263ceb04-f909-45d8-b9b2-5de86617ea25@stanley.mountain>
Date: Wed, 9 Oct 2024 23:45:01 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: "Everest K.C." <everestkc@...restkc.com.np>,
	Jeff Layton <jlayton@...nel.org>
Cc: viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
	skhan@...uxfoundation.org, linux-fsdevel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] fs: Fix uninitialized scalar variable now

On Wed, Oct 09, 2024 at 02:05:25PM -0600, Everest K.C. wrote:
> Variable `now` is declared without initialization. The variable
> could be accessed inside the if-else statements following the
> variable declaration, before it has been initialized.
> 
> This patch initializes the variable to
> `inode_set_ctime_current(inode)` by default.
> 
> This issue was reported by Coverity Scan.
> 
> Signed-off-by: Everest K.C. <everestkc@...restkc.com.np>

Fixes: d8d11298e8a1 ("fs: handle delegated timestamps in setattr_copy_mgtime")

Maybe the WARN_ON_ONCE() should be updated to check ATTR_ATIME as well?

regards,
dan carpenter

> ---
>  fs/attr.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/attr.c b/fs/attr.c
> index c614b954bda5..77523af2e62d 100644
> --- a/fs/attr.c
> +++ b/fs/attr.c
> @@ -284,7 +284,7 @@ EXPORT_SYMBOL(inode_newsize_ok);
>  static void setattr_copy_mgtime(struct inode *inode, const struct iattr *attr)
>  {
>  	unsigned int ia_valid = attr->ia_valid;
> -	struct timespec64 now;
> +	struct timespec64 now = inode_set_ctime_current(inode);
>  
>  	if (ia_valid & ATTR_CTIME) {
>  		/*
> @@ -293,8 +293,6 @@ static void setattr_copy_mgtime(struct inode *inode, const struct iattr *attr)
>  		 */
>  		if (ia_valid & ATTR_DELEG)
>  			now = inode_set_ctime_deleg(inode, attr->ia_ctime);
> -		else
> -			now = inode_set_ctime_current(inode);
>  	} else {
>  		/* If ATTR_CTIME isn't set, then ATTR_MTIME shouldn't be either. */
>  		WARN_ON_ONCE(ia_valid & ATTR_MTIME);
> -- 
> 2.43.0
>