From 1ff595d218d9175eee1db753844044c2746d0515 Mon Sep 17 00:00:00 2001 From: Denton Liu Date: Wed, 12 May 2021 13:16:13 -0700 Subject: [PATCH] stash show: fix segfault with --{include,only}-untracked When `git stash show --include-untracked` or `git stash show --only-untracked` is run on a stash that doesn't include an untracked entry, a segfault occurs. This happens because we do not check whether the untracked entry is actually present and just attempt to blindly dereference it. Ensure that the untracked entry is present before actually attempting to dereference it. Signed-off-by: Denton Liu Signed-off-by: Junio C Hamano --- builtin/stash.c | 8 ++++++-- t/t3905-stash-include-untracked.sh | 15 +++++++++++++++ 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/builtin/stash.c b/builtin/stash.c index 8922a1240c6344..82e4829d447a4f 100644 --- a/builtin/stash.c +++ b/builtin/stash.c @@ -900,10 +900,14 @@ static int show_stash(int argc, const char **argv, const char *prefix) diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt); break; case UNTRACKED_ONLY: - diff_root_tree_oid(&info.u_tree, "", &rev.diffopt); + if (info.has_u) + diff_root_tree_oid(&info.u_tree, "", &rev.diffopt); break; case UNTRACKED_INCLUDE: - diff_include_untracked(&info, &rev.diffopt); + if (info.has_u) + diff_include_untracked(&info, &rev.diffopt); + else + diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt); break; } log_tree_diff_flush(&rev); diff --git a/t/t3905-stash-include-untracked.sh b/t/t3905-stash-include-untracked.sh index 2e6796725bd60e..1c9765928d0f72 100755 --- a/t/t3905-stash-include-untracked.sh +++ b/t/t3905-stash-include-untracked.sh @@ -405,4 +405,19 @@ test_expect_success 'stash show --include-untracked errors on duplicate files' ' test_i18ngrep "worktree and untracked commit have duplicate entries: tracked" err ' +test_expect_success 'stash show --{include,only}-untracked on stashes without untracked entries' ' + git reset --hard && + git clean -xf && + >tracked && + git add tracked && + git stash && + + git stash show >expect && + git stash show --include-untracked >actual && + test_cmp expect actual && + + git stash show --only-untracked >actual && + test_must_be_empty actual +' + test_done