2022-03-23 15:33:47

by Christophe JAILLET

[permalink] [raw]
Subject: [PATCH v2] ksmbd: Remove a redundant zeroing of memory

fill_transform_hdr() has only one caller that already clears tr_buf (it is
kzalloc'ed).

So there is no need to clear it another time here.

Remove the superfluous memset() and add a comment to remind that the caller
must clear the buffer.

Signed-off-by: Christophe JAILLET <[email protected]>
---
v2: keep kzalloc in the caller and remove the memset here
---
fs/ksmbd/smb2pdu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index bcb98109bac9..bcd1bb7e2856 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -8410,7 +8410,7 @@ static void fill_transform_hdr(void *tr_buf, char *old_buf, __le16 cipher_type)
struct smb2_hdr *hdr = smb2_get_msg(old_buf);
unsigned int orig_len = get_rfc1002_len(old_buf);

- memset(tr_buf, 0, sizeof(struct smb2_transform_hdr) + 4);
+ /* tr_buf must be cleared by the caller */
tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
tr_hdr->Flags = cpu_to_le16(TRANSFORM_FLAG_ENCRYPTED);
--
2.32.0


2022-03-23 19:40:29

by Namjae Jeon

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Subject: Re: [PATCH v2] ksmbd: Remove a redundant zeroing of memory

2022-03-23 15:32 GMT+09:00, Christophe JAILLET <[email protected]>:
> fill_transform_hdr() has only one caller that already clears tr_buf (it is
> kzalloc'ed).
>
> So there is no need to clear it another time here.
>
> Remove the superfluous memset() and add a comment to remind that the caller
> must clear the buffer.
>
> Signed-off-by: Christophe JAILLET <[email protected]>
Acked-by: Namjae Jeon <[email protected]>

Thanks!

2022-03-25 17:59:45

by Dan Carpenter

[permalink] [raw]
Subject: Re: [PATCH v2] ksmbd: Remove a redundant zeroing of memory

On Wed, Mar 23, 2022 at 07:32:05AM +0100, Christophe JAILLET wrote:
> fill_transform_hdr() has only one caller that already clears tr_buf (it is
> kzalloc'ed).
>
> So there is no need to clear it another time here.
>
> Remove the superfluous memset() and add a comment to remind that the caller
> must clear the buffer.
>
> Signed-off-by: Christophe JAILLET <[email protected]>
> ---
> v2: keep kzalloc in the caller and remove the memset here

I kind of prefered v1. I misread the code and was looking at the wrong
fill_transform_hdr() function from the other driver.

regards,
dan carpenter