[PATCH v3 2/4] mktree: plug per-tree leak in --batch mode

From: Elijah Newren via GitGitGadget <gitgitgadget@gmail.com>
Date: Aug 29, 2026, 07:00 UTC
Message-ID: <3f3b75690eea02960c7edc8d318ce7dff654f1bc.1787986831.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.2207.v3.git.1787986831.gitgitgadget@gmail.com>

From: Elijah Newren <newren@gmail.com>

In --batch mode "git mktree" reuses its entry buffer across trees, resetting `used` to 0 after writing each tree. It never frees the `treeent` structures the previous tree appended, though, so once the next tree overwrites those slots the earlier allocations are leaked. A single-tree invocation hides this, as the entries stay reachable through the `entries` global until exit.

Free each entry when resetting the buffer, and free the buffer itself before returning.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 builtin/mktree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/builtin/mktree.c b/builtin/mktree.c
index 4084e32476..dc2d293c3d 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -200,8 +200,11 @@ int cmd_mktree(int ac,
 			puts(oid_to_hex(&oid));
 			fflush(stdout);
 		}
+		for (int i = 0; i < used; i++)
+			free(entries[i]);
 		used=0; /* reset tree entry buffer for re-use in batch mode */
 	}
+	free(entries);
 	strbuf_release(&sb);
 
 	return 0;

-- 
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