[PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[Sun Ke]

The cache_size field of copen is specified by the user daemon.
If cache_size < 0, then the OPEN request is expected to fail,
while copen itself shall succeed. However, returning 0 is indeed
unexpected when cache_size is an invalid error code.

Fix this by returning error when cache_size is an invalid error code.

Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie")
Signed-off-by: Sun Ke <sunke32@huawei.com>
Suggested-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v4: update the code suggested by Dan
v3: update the commit log suggested by Jingbo.
 fs/cachefiles/ondemand.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index 1fee702d5529..7e1586bd5cf3 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -158,9 +158,13 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
 
 	/* fail OPEN request if daemon reports an error */
 	if (size < 0) {
-		if (!IS_ERR_VALUE(size))
-			size = -EINVAL;
-		req->error = size;
+		if (!IS_ERR_VALUE(size)) {
+			req->error = -EINVAL;
+			ret = -EINVAL;
+		} else {
+			req->error = size;
+			ret = 0;
+		}
 		goto out;
 	}
 
-- 
2.31.1

Re: [PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[Gao Xiang]

On Fri, Aug 26, 2022 at 10:35:15AM +0800, Sun Ke wrote:
> The cache_size field of copen is specified by the user daemon.
> If cache_size < 0, then the OPEN request is expected to fail,
> while copen itself shall succeed. However, returning 0 is indeed
> unexpected when cache_size is an invalid error code.
> 
> Fix this by returning error when cache_size is an invalid error code.
> 
> Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie")
> Signed-off-by: Sun Ke <sunke32@huawei.com>
> Suggested-by: Jeffle Xu <jefflexu@linux.alibaba.com>
> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>

Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Thanks,
Gao Xiang

Re: [PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[Dan Carpenter]

On Fri, Aug 26, 2022 at 10:35:15AM +0800, Sun Ke wrote:
> The cache_size field of copen is specified by the user daemon.
> If cache_size < 0, then the OPEN request is expected to fail,
> while copen itself shall succeed. However, returning 0 is indeed
> unexpected when cache_size is an invalid error code.
> 
> Fix this by returning error when cache_size is an invalid error code.
> 
> Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie")
> Signed-off-by: Sun Ke <sunke32@huawei.com>
> Suggested-by: Jeffle Xu <jefflexu@linux.alibaba.com>
> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> v4: update the code suggested by Dan
> v3: update the commit log suggested by Jingbo.

Thanks!

regards,
dan carpenter

Re: [PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[JeffleXu]

On 8/26/22 10:35 AM, Sun Ke wrote:
> The cache_size field of copen is specified by the user daemon.
> If cache_size < 0, then the OPEN request is expected to fail,
> while copen itself shall succeed. However, returning 0 is indeed
> unexpected when cache_size is an invalid error code.
> 
> Fix this by returning error when cache_size is an invalid error code.
> 
> Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie")
> Signed-off-by: Sun Ke <sunke32@huawei.com>
> Suggested-by: Jeffle Xu <jefflexu@linux.alibaba.com>
> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>

Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>

Thanks Sun. Also thanks Dan for the suggestion.


Jingbo Xu

> ---
> v4: update the code suggested by Dan
> v3: update the commit log suggested by Jingbo.
>  fs/cachefiles/ondemand.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
> index 1fee702d5529..7e1586bd5cf3 100644
> --- a/fs/cachefiles/ondemand.c
> +++ b/fs/cachefiles/ondemand.c
> @@ -158,9 +158,13 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args)
>  
>  	/* fail OPEN request if daemon reports an error */
>  	if (size < 0) {
> -		if (!IS_ERR_VALUE(size))
> -			size = -EINVAL;
> -		req->error = size;
> +		if (!IS_ERR_VALUE(size)) {
> +			req->error = -EINVAL;
> +			ret = -EINVAL;
> +		} else {
> +			req->error = size;
> +			ret = 0;
> +		}
>  		goto out;
>  	}
>  

-- 
Thanks,
Jingbo

Re: [PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[David Howells]

Dan Carpenter <dan.carpenter@oracle.com> wrote:

> Thanks!

Can I put that down as a Reviewed-by?

David

Re: [PATCH v4] cachefiles: fix error return code in cachefiles_ondemand_copen()

[Dan Carpenter]

On Wed, Aug 31, 2022 at 02:52:19PM +0100, David Howells wrote:
> Dan Carpenter <dan.carpenter@oracle.com> wrote:
> 
> > Thanks!
> 
> Can I put that down as a Reviewed-by?

Sure.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>

regards,
dan carpenter