Re: [PATCH] check_aliased_update: strcpy() instead of strcat() to copy

[Jay Soffian <jaysoffian@gmail.com>]

On Thu, Jun 10, 2010 at 2:43 PM, Thomas Rast <trast@student.ethz.ch> wrote:
> da3efdb (receive-pack: detect aliased updates which can occur with
> symrefs, 2010-04-19) introduced two strcat() into uninitialized
> strings.  The intent was clearly make a copy of the static buffer used
> by find_unique_abbrev(), so use strcpy() instead.
>
> Signed-off-by: Thomas Rast <trast@student.ethz.ch>
> Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
>
>> Actually I think my test failure is related to da3efdb17b, see the
>> "[PATCH v2 2/2] receive-pack: detect aliased updates which can occur
>> with symrefs" thread.
>
> Indeed, there's another bug in this one.  (And valgrind catches it
> too...  if only I had the patience to let it churn through t5516!)
>
> Unlike the other bug, this one is already in master.
>
>  builtin/receive-pack.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
> index bb34757..7e4129d 100644
> --- a/builtin/receive-pack.c
> +++ b/builtin/receive-pack.c
> @@ -515,9 +515,9 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
>        dst_cmd->skip_update = 1;
>
>        strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
> -       strcat(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
> +       strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
>        strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
> -       strcat(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
> +       strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
>        rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
>                 " its target '%s' (%s..%s)",
>                 cmd->ref_name, cmd_oldh, cmd_newh,

Thanks. I cannot imagine what I was thinking. Maybe a cut-and-paste
error from somewhere else. I am sad this made it all the way to
master.

j.