Re: [PATCH 1/2] apply: guard against renames of non-existant empty files

["Philip Oakley" <philipoakley@iee.org>]

From: "Vegard Nossum" <vegard.nossum@oracle.com>
> If we have a patch like the one in the new test-case, then we will

"the one in the new test-case" needs a clearer reference to the particular 
case so that future readers will know what it refers to. Noticed while 
browsing the commit message..

..reads further; Maybe it's "AFL (American fuzzy lop) found a failure. Add a 
new test case and fix the fault"?

[same for patch 2]

> try to rename a non-existant empty file, i.e. patch->old_name will
> be NULL. In this case, a NULL entry will be added to fn_table, which
> is not allowed (a subsequent binary search will die with a NULL
> pointer dereference).
>
> The patch file is completely bogus as it tries to rename something
> that is known not to exist, so we can throw an error for this.
>
> Found using AFL.
>
> Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
> ---
> apply.c                     |  3 ++-
> t/t4154-apply-git-header.sh | 15 +++++++++++++++
> 2 files changed, 17 insertions(+), 1 deletion(-)
> create mode 100755 t/t4154-apply-git-header.sh
>
> diff --git a/apply.c b/apply.c
> index 0e2caeab9..cbf7cc7f2 100644
> --- a/apply.c
> +++ b/apply.c
> @@ -1585,7 +1585,8 @@ static int find_header(struct apply_state *state,
>  patch->old_name = xstrdup(patch->def_name);
>  patch->new_name = xstrdup(patch->def_name);
>  }
> - if (!patch->is_delete && !patch->new_name) {
> + if ((!patch->is_delete && !patch->new_name) ||
> +     (patch->is_rename && !patch->old_name)) {
>  error(_("git diff header lacks filename information "
>       "(line %d)"), state->linenr);
>  return -128;
> diff --git a/t/t4154-apply-git-header.sh b/t/t4154-apply-git-header.sh
> new file mode 100755
> index 000000000..d651af4a2
> --- /dev/null
> +++ b/t/t4154-apply-git-header.sh
> @@ -0,0 +1,15 @@
> +#!/bin/sh
> +
> +test_description='apply with git/--git headers'
> +
> +. ./test-lib.sh
> +
> +test_expect_success 'apply old mode / rename new' '
> + test_must_fail git apply << EOF
> +diff --git a/1 b/1
> +old mode 0
> +rename new 0
> +EOF
> +'
> +
> +test_done
> -- 
> 2.12.0.rc0
--
Philip