[PATCH v2 0/2] Fix segmentation fault with cherry-pick

The culprit is actually not cherry-pick, but a special code path that expects refresh_cache_entry() not to return NULL. And the fix is to teach it to handle NULL there.

This bug was brought to my attention by Markus Klein via https://github.com/git-for-windows/git/issues/952.

Changes since v1:

- changed test title

- avoided ambiguous refname in test

Johannes Schindelin (2):
  cherry-pick: demonstrate a segmentation fault
  Avoid a segmentation fault with renaming merges

 merge-recursive.c             |  2 ++
 t/t3501-revert-cherry-pick.sh | 12 ++++++++++++
 2 files changed, 14 insertions(+)

base-commit: e2b2d6a172b76d44cb7b1ddb12ea5bfac9613a44
Published-As: https://github.com/dscho/git/releases/tag/cherry-pick-segfault-v2
Fetch-It-Via: git fetch https://github.com/dscho/git cherry-pick-segfault-v2

Interdiff vs v1:

 diff --git a/t/t3501-revert-cherry-pick.sh b/t/t3501-revert-cherry-pick.sh
 index 8e21840f11..4f2a263b63 100755
 --- a/t/t3501-revert-cherry-pick.sh
 +++ b/t/t3501-revert-cherry-pick.sh
 @@ -141,7 +141,7 @@ test_expect_success 'cherry-pick "-" works with arguments' '
  	test_cmp expect actual
  '
  
 -test_expect_success 'cherry-pick fails gracefully with dirty renamed file' '
 +test_expect_success 'cherry-pick works with dirty renamed file' '
  	test_commit to-rename &&
  	git checkout -b unrelated &&
  	test_commit unrelated &&
 @@ -150,7 +150,7 @@ test_expect_success 'cherry-pick fails gracefully with dirty renamed file' '
  	test_tick &&
  	git commit -m renamed &&
  	echo modified >renamed &&
 -	git cherry-pick unrelated
 +	git cherry-pick refs/heads/unrelated
  '
  
  test_done