Re: [PATCH] target: iscsi: iscsi_target_tpg.c: Cleaning up possible size overwriting in conjunction with sprintf

From: Joe Perches
Date: Sun Oct 12 2014 - 14:18:51 EST

On Sun, 2014-10-12 at 19:55 +0200, Rickard Strandqvist wrote:
> Changed same snprintf and sprintf to strlcpy and strlcat.
> This will guarantee that the string size is not overwritten,
> and they are significantly faster than sprintf also.

I don't disagree with the change, but I think the changelog is

strlcpy(ptr, ...) then strlcat(ptr, ...) does not use the known
length of the first copied string and is generally not faster than
ptr += snprintf(ptr, ...) then sprintf(ptr,...)

And a couple slightly unrelated bits:

> diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
> index c3cb5c1..6fc8bfe 100644
> --- a/drivers/target/iscsi/iscsi_target_tpg.c
> +++ b/drivers/target/iscsi/iscsi_target_tpg.c
> @@ -608,7 +608,6 @@ int iscsit_tpg_set_initiator_node_queue_depth(
> int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)

This function could be made static and the prototype removed from
the .h file if it is moved above its one caller in this file.

> {
> unsigned char buf1[256], buf2[256], *none = NULL;

Moderately large stack use here.

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