git@vger.kernel.org mailing list mirror (one of many)
 help / color / mirror / code / Atom feed
From: "Nipunn Koorapati via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Nipunn Koorapati <nipunn1313@gmail.com>
Subject: [PATCH v2 0/2] negative-refspec: fix segfault on : refspec
Date: Sat, 19 Dec 2020 21:58:35 +0000	[thread overview]
Message-ID: <pull.820.v2.git.1608415117.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.820.git.1608398598893.gitgitgadget@gmail.com>

Previously, if remote.origin.push was set to ":", git would segfault during
a push operation, due to bad parsing logic in
query_matches_negative_refspec. Per bisect, the bug was introduced in:
c0192df630 (refspec: add support for negative refspecs, 2020-09-30)

We found this issue when rolling out git 2.29 at Dropbox - as several folks
had "push = :" in their configuration. I based my diff off the master
branch, but also confirmed that it patches cleanly onto maint - if the
maintainers would like to also fix the segfault on 2.29

Update since Patch series V1:

 * Handled matching refspec explicitly
 * Added testing for "+:" case
 * Added comment explaining how the two loops work together

It may be wise to add additional testing for a case with a matching refspec
+ negative refspec with expected behavior

Nipunn Koorapati (2):
  negative-refspec: fix segfault on : refspec
  negative-refspec: improve comment on query_matches_negative_refspec

 remote.c                          | 16 +++++++++++++---
 t/t5582-fetch-negative-refspec.sh | 15 +++++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)


base-commit: 6d3ef5b467eccd2769f1aa1c555d317d3c8dc707
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-820%2Fnipunn1313%2Fnk%2Fpush-refspec-segfault-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-820/nipunn1313/nk/push-refspec-segfault-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/820

Range-diff vs v1:

 1:  743e848653f ! 1:  e42200b644a negative-refspec: fix segfault on : refspec
     @@ Metadata
       ## Commit message ##
          negative-refspec: fix segfault on : refspec
      
     -    Previously, if remote.origin.push was set to ":",
     -    git would segfault during a push operation, due to bad
     -    parsing logic in query_matches_negative_refspec. Per
     -    bisect, the bug was introduced in:
     -    c0192df630 (refspec: add support for negative refspecs, 2020-09-30)
     +    The logic added to check for negative pathspec match by c0192df630
     +    (refspec: add support for negative refspecs, 2020-09-30) looks at
     +    refspec->src assuming it is never NULL, however when
     +    remote.origin.push is set to ":", then refspec->src is NULL,
     +    causing a segfault within strcmp
      
          Added testing for this case in fetch-negative-refspec
      
     @@ remote.c: static int query_matches_negative_refspec(struct refspec *rs, struct r
      -		} else {
      -			if (!strcmp(needle, refspec->src))
      -				string_list_append(&reversed, refspec->src);
     -+		} else if (refspec->src != NULL && !strcmp(needle, refspec->src)) {
     ++		} else if (refspec->matching) {
     ++			/* For the special matching refspec, any query should match */
     ++			string_list_append(&reversed, needle);
     ++		} else if (refspec->src == NULL) {
     ++			BUG("refspec->src should not be null here");
     ++		} else if (!strcmp(needle, refspec->src)) {
      +			string_list_append(&reversed, refspec->src);
       		}
       	}
     @@ t/t5582-fetch-negative-refspec.sh: test_expect_success "fetch --prune with negat
       	)
       '
       
     -+test_expect_success "push with empty refspec" '
     ++test_expect_success "push with matching ':' refspec" '
      +	(
      +		cd two &&
      +		git config remote.one.push : &&
      +		# Fails w/ tip behind counterpart - but should not segfault
      +		test_must_fail git push one master &&
     ++
     ++		git config remote.one.push +: &&
     ++		# Fails w/ tip behind counterpart - but should not segfault
     ++		test_must_fail git push one master &&
     ++
      +		git config --unset remote.one.push
      +	)
      +'
 -:  ----------- > 2:  8da8d9cd1c5 negative-refspec: improve comment on query_matches_negative_refspec

-- 
gitgitgadget

  parent reply	other threads:[~2020-12-19 22:01 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-19 17:23 [PATCH] negative-refspec: fix segfault on : refspec Nipunn Koorapati via GitGitGadget
2020-12-19 18:05 ` Junio C Hamano
2021-02-19  9:28   ` Jacob Keller
2020-12-19 21:58 ` Nipunn Koorapati via GitGitGadget [this message]
2020-12-19 21:58   ` [PATCH v2 1/2] " Nipunn Koorapati via GitGitGadget
2020-12-20  2:57     ` Eric Sunshine
2020-12-19 21:58   ` [PATCH v2 2/2] negative-refspec: improve comment on query_matches_negative_refspec Nipunn Koorapati via GitGitGadget
2020-12-21  2:05   ` [PATCH v3 0/3] negative-refspec: fix segfault on : refspec Nipunn Koorapati via GitGitGadget
2020-12-21  2:05     ` [PATCH v3 1/3] test-lib-functions: handle --add in test_config Nipunn Koorapati via GitGitGadget
2020-12-21  7:07       ` Eric Sunshine
2020-12-21 19:00         ` Junio C Hamano
2020-12-21 20:08           ` Eric Sunshine
2020-12-22  0:00             ` Nipunn Koorapati
2020-12-22  0:13               ` Eric Sunshine
2020-12-22  2:25                 ` Nipunn Koorapati
2020-12-22  5:19                   ` Eric Sunshine
2020-12-21  2:05     ` [PATCH v3 2/3] negative-refspec: fix segfault on : refspec Nipunn Koorapati via GitGitGadget
2020-12-21  7:20       ` Eric Sunshine
2020-12-21  2:05     ` [PATCH v3 3/3] negative-refspec: improve comment on query_matches_negative_refspec Nipunn Koorapati via GitGitGadget
2020-12-22  1:11     ` [PATCH v4 0/2] negative-refspec: fix segfault on : refspec Nipunn Koorapati via GitGitGadget
2020-12-22  1:11       ` [PATCH v4 1/2] " Nipunn Koorapati via GitGitGadget
2020-12-22  2:08         ` Junio C Hamano
2020-12-22  2:28           ` Junio C Hamano
2020-12-22  1:11       ` [PATCH v4 2/2] negative-refspec: improve comment on query_matches_negative_refspec Nipunn Koorapati via GitGitGadget
2020-12-22  3:58       ` [PATCH v5 0/2] negative-refspec: fix segfault on : refspec Nipunn Koorapati via GitGitGadget
2020-12-22  3:58         ` [PATCH v5 1/2] " Nipunn Koorapati via GitGitGadget
2021-02-19  9:32           ` Jacob Keller
2020-12-22  3:58         ` [PATCH v5 2/2] negative-refspec: improve comment on query_matches_negative_refspec Nipunn Koorapati via GitGitGadget
2020-12-22  6:48         ` [PATCH v5 0/2] negative-refspec: fix segfault on : refspec Junio C Hamano
2020-12-23 23:56           ` Nipunn Koorapati
2020-12-24  0:00             ` Junio C Hamano
2021-01-11 20:22               ` Nipunn Koorapati
2021-01-12  2:01                 ` Junio C Hamano

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=pull.820.v2.git.1608415117.gitgitgadget@gmail.com \
    --to=gitgitgadget@gmail.com \
    --cc=git@vger.kernel.org \
    --cc=nipunn1313@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).