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lockfile API users: simplify and don't leak "path"

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Fix a memory leak in code added in 6c622f9f0b (commit-graph: write
commit-graph chains, 2019-06-18). We needed to free the "lock_name" if
we encounter errors, and the "graph_name" after we'd run unlink() on
it.

For the case of write_commit_graph_file() refactoring the code to free
the "lock_name" after we were done using the "struct lock_file lk"
would have made the control flow more complex. Luckily we can free the
"lock_file" right after the hold_lock_file_for_update() call, if it
makes use of "path" at all it'll have copied its contents to a "struct
strbuf" of its own.

While I'm at it let's fix code added in fb10ca5b54 (sparse-checkout:
write using lockfile, 2019-11-21) in write_patterns_and_update() to
avoid the same complexity that I thought I needed when I wrote the
initial fix for write_commit_graph_file(). We can free the
"sparse_filename" right after calling hold_lock_file_for_update(), we
don't need to wait until we're exiting the function to do so.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-03-04 19:32:14 +01:00 committed by Junio C Hamano
parent 51a94d8ffe
commit ef3fe21448
2 changed files with 3 additions and 2 deletions
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3
builtin/sparse-checkout.c
View File

@ -328,11 +328,11 @@ static int write_patterns_and_update(struct pattern_list *pl)
fd = hold_lock_file_for_update(&lk, sparse_filename,
LOCK_DIE_ON_ERROR);
free(sparse_filename);
result = update_working_directory(pl);
if (result) {
rollback_lock_file(&lk);
free(sparse_filename);
clear_pattern_list(pl);
update_working_directory(NULL);
return result;
@ -348,7 +348,6 @@ static int write_patterns_and_update(struct pattern_list *pl)
fflush(fp);
commit_lock_file(&lk);
free(sparse_filename);
clear_pattern_list(pl);
return 0;

2
commit-graph.c
View File

@ -1854,6 +1854,7 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
hold_lock_file_for_update_mode(&lk, lock_name,
LOCK_DIE_ON_ERROR, 0444);
free(lock_name);
fd = git_mkstemp_mode(ctx->graph_name, 0444);
if (fd < 0) {
@ -1978,6 +1979,7 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
} else {
char *graph_name = get_commit_graph_filename(ctx->odb);
unlink(graph_name);
free(graph_name);
}
ctx->commit_graph_hash_after[ctx->num_commit_graphs_after - 1] = xstrdup(hash_to_hex(file_hash));