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merge-ort: fix massive leak

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When a series of merges was performed (such as for a rebase or series of
cherry-picks), only the data structures allocated by the final merge
operation were being freed.  The problem was that while picking out
pieces of merge-ort to upstream, I previously misread a certain section
of merge_start() and assumed it was associated with a later
optimization.  Include that section now, which ensures that if there was
a previous merge operation, that we clear out result->priv and then
re-use it for opt->priv, and otherwise we allocate opt->priv.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2021-01-23 22:01:10 -08:00 committed by Junio C Hamano
parent fe2f4d0031
commit cf8937acde
1 changed files with 17 additions and 0 deletions
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17
merge-ort.c
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@ -3227,11 +3227,28 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
assert(opt->obuf.len == 0);
assert(opt->priv == NULL);
if (result->priv) {
opt->priv = result->priv;
result->priv = NULL;
/*
* opt->priv non-NULL means we had results from a previous
* run; do a few sanity checks that user didn't mess with
* it in an obvious fashion.
*/
assert(opt->priv->call_depth == 0);
assert(!opt->priv->toplevel_dir ||
0 == strlen(opt->priv->toplevel_dir));
}
/* Default to histogram diff. Actually, just hardcode it...for now. */
opt->xdl_opts = DIFF_WITH_ALG(opt, HISTOGRAM_DIFF);
/* Initialization of opt->priv, our internal merge data */
if (opt->priv) {
clear_or_reinit_internal_opts(opt->priv, 1);
trace2_region_leave("merge", "allocate/init", opt->repo);
return;
}
opt->priv = xcalloc(1, sizeof(*opt->priv));
/* Initialization of various renames fields */