* [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup()
@ 2024-08-26 9:08 Yan Zhen
2024-08-26 10:39 ` Christian Brauner
2024-08-26 13:49 ` Al Viro
0 siblings, 2 replies; 3+ messages in thread
From: Yan Zhen @ 2024-08-26 9:08 UTC (permalink / raw)
To: viro, brauner; +Cc: jack, linux-fsdevel, opensource.kernel, Yan Zhen
The d_hash_and_lookup() function returns either an error pointer or NULL.
It might be more appropriate to check error using IS_ERR_OR_NULL().
Signed-off-by: Yan Zhen <yanzhen@vivo.com>
---
fs/proc/base.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index f83d41bf155d..e08b36dd4766 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2123,7 +2123,7 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
ino_t ino = 1;
child = d_hash_and_lookup(dir, &qname);
- if (!child) {
+ if (IS_ERR_OR_NULL(child)) {
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
child = d_alloc_parallel(dir, &qname, &wq);
if (IS_ERR(child))
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup()
2024-08-26 9:08 [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup() Yan Zhen
@ 2024-08-26 10:39 ` Christian Brauner
2024-08-26 13:49 ` Al Viro
1 sibling, 0 replies; 3+ messages in thread
From: Christian Brauner @ 2024-08-26 10:39 UTC (permalink / raw)
To: Yan Zhen; +Cc: viro, jack, linux-fsdevel, opensource.kernel
On Mon, Aug 26, 2024 at 05:08:02PM GMT, Yan Zhen wrote:
> The d_hash_and_lookup() function returns either an error pointer or NULL.
>
> It might be more appropriate to check error using IS_ERR_OR_NULL().
>
> Signed-off-by: Yan Zhen <yanzhen@vivo.com>
> ---
I distinctly remember having NAKed a patch like this either earlier this
or last year. Procfs doesn't have a custom d_hash() function so
d_hash_and_lookup() will never return an error pointer afaict.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup()
2024-08-26 9:08 [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup() Yan Zhen
2024-08-26 10:39 ` Christian Brauner
@ 2024-08-26 13:49 ` Al Viro
1 sibling, 0 replies; 3+ messages in thread
From: Al Viro @ 2024-08-26 13:49 UTC (permalink / raw)
To: Yan Zhen; +Cc: brauner, jack, linux-fsdevel, opensource.kernel
On Mon, Aug 26, 2024 at 05:08:02PM +0800, Yan Zhen wrote:
> The d_hash_and_lookup() function returns either an error pointer or NULL.
>
> It might be more appropriate to check error using IS_ERR_OR_NULL().
Not for procfs it doesn't. Please, don't use that shite.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-08-26 9:08 [PATCH v1] fs: proc: Fix error checking for d_hash_and_lookup() Yan Zhen
2024-08-26 10:39 ` Christian Brauner
2024-08-26 13:49 ` Al Viro
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