From: Derrick Stolee <stolee@gmail.com>
To: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org
Cc: peff@peff.net, Junio C Hamano <gitster@pobox.com>,
Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v2 1/1] commit-reach: properly peel tags
Date: Thu, 13 Sep 2018 12:38:16 -0400 [thread overview]
Message-ID: <8d6061de-1654-577c-40c6-211dbd03aa36@gmail.com> (raw)
In-Reply-To: <4bf21204ddf8b9daa823db9954ddde98ab264a1b.1536855032.git.gitgitgadget@gmail.com>
On 9/13/2018 12:10 PM, Derrick Stolee via GitGitGadget wrote:
> From: Derrick Stolee <dstolee@microsoft.com>
>
> The can_all_from_reach_with_flag() algorithm was refactored in 4fbcca4e
> "commit-reach: make can_all_from_reach... linear" but incorrectly
> assumed that all objects provided were commits. During a fetch
> negotiation, ok_to_give_up() in upload-pack.c may provide unpeeled tags
> to the 'from' array. The current code creates a segfault.
>
> Add a direct call to can_all_from_reach_with_flag() in 'test-tool reach'
> and add a test in t6600-test-reach.sh that demonstrates this segfault.
>
> Correct the issue by peeling tags when investigating the initial list
> of objects in the 'from' array.
>
> Signed-off-by: Jeff King <peff@peff.net>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> commit-reach.c | 33 ++++++++++++++++++++++++++-------
> t/helper/test-reach.c | 22 +++++++++++++++++-----
> t/t6600-test-reach.sh | 30 ++++++++++++++++++++++++++++--
> 3 files changed, 71 insertions(+), 14 deletions(-)
>
> diff --git a/commit-reach.c b/commit-reach.c
> index 86715c103c..4048a2132a 100644
> --- a/commit-reach.c
> +++ b/commit-reach.c
> @@ -544,20 +544,39 @@ int can_all_from_reach_with_flag(struct object_array *from,
> {
> struct commit **list = NULL;
> int i;
> + int nr_commits;
> int result = 1;
>
> ALLOC_ARRAY(list, from->nr);
> + nr_commits = 0;
> for (i = 0; i < from->nr; i++) {
> - list[i] = (struct commit *)from->objects[i].item;
> + struct object *from_one = from->objects[i].item;
>
> - if (parse_commit(list[i]) ||
> - list[i]->generation < min_generation)
> - return 0;
> + if (!from_one || from_one->flags & assign_flag)
> + continue;
> +
> + from_one = deref_tag(the_repository, from_one,
> + "a from object", 0);
> + if (!from_one || from_one->type != OBJ_COMMIT) {
> + /* no way to tell if this is reachable by
> + * looking at the ancestry chain alone, so
> + * leave a note to ourselves not to worry about
> + * this object anymore.
> + */
> + from->objects[i].item->flags |= assign_flag;
> + continue;
> + }
> +
> + list[nr_commits] = (struct commit *)from_one;
> + if (parse_commit(list[nr_commits]) ||
> + list[nr_commits]->generation < min_generation)
> + return 0; /* is this a leak? */
Of course, after sending v2, I see this comment. This is a leak of
'list' and should be fixed.
Not only is it a leak here, it is also a leak in the 'cleanup' section.
I'll squash the following into v3, but I'll let v2 simmer for review
before rerolling.
diff --git a/commit-reach.c b/commit-reach.c
index 4048a2132a..c457d8d85f 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -569,8 +569,11 @@ int can_all_from_reach_with_flag(struct
object_array *from,
list[nr_commits] = (struct commit *)from_one;
if (parse_commit(list[nr_commits]) ||
- list[nr_commits]->generation < min_generation)
- return 0; /* is this a leak? */
+ list[nr_commits]->generation < min_generation) {
+ result = 0;
+ goto cleanup;
+ }
+
nr_commits++;
}
@@ -623,6 +626,7 @@ int can_all_from_reach_with_flag(struct object_array
*from,
clear_commit_marks(list[i], RESULT);
clear_commit_marks(list[i], assign_flag);
}
+ free(list);
return result;
}
next prev parent reply other threads:[~2018-09-13 16:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-12 14:22 [PATCH 0/1] Properly peel tags in can_all_from_reach_with_flags() Derrick Stolee via GitGitGadget
2018-09-12 14:22 ` [PATCH 1/1] commit-reach: properly peel tags Derrick Stolee via GitGitGadget
2018-09-12 19:41 ` Jeff King
2018-09-12 21:23 ` Junio C Hamano
2018-09-12 21:34 ` Jeff King
2018-09-13 16:10 ` [PATCH v2 0/1] Properly peel tags in can_all_from_reach_with_flags() Derrick Stolee via GitGitGadget
2018-09-13 16:10 ` [PATCH v2 1/1] commit-reach: properly peel tags Derrick Stolee via GitGitGadget
2018-09-13 16:38 ` Derrick Stolee [this message]
2018-09-13 21:06 ` Junio C Hamano
2018-09-21 15:05 ` [PATCH v3 0/2] Properly peel tags in can_all_from_reach_with_flags() Derrick Stolee via GitGitGadget
2018-09-21 15:05 ` [PATCH v3 1/2] commit-reach: properly peel tags Derrick Stolee via GitGitGadget
2018-09-21 23:56 ` Jeff King
2018-09-24 11:48 ` Derrick Stolee
2018-09-21 15:05 ` [PATCH v3 2/2] commit-reach: fix memory and flag leaks Derrick Stolee via GitGitGadget
2018-09-21 23:58 ` Jeff King
2018-09-24 17:25 ` Derrick Stolee
2018-09-24 19:06 ` Jeff King
2018-09-24 20:57 ` [PATCH v4 0/1] Properly peel tags in can_all_from_reach_with_flags() Derrick Stolee via GitGitGadget
2018-09-24 20:57 ` [PATCH v4 1/1] commit-reach: properly peel tags and clear flags Derrick Stolee via GitGitGadget
2018-09-24 21:09 ` Jeff King
2018-09-25 5:17 ` Eric Sunshine
2018-09-25 13:27 ` [PATCH] commit-reach: cleanups in can_all_from_reach Derrick Stolee
2018-09-25 18:06 ` Junio C Hamano
2018-09-25 18:13 ` Derrick Stolee
2018-09-25 20:29 ` Junio C Hamano
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