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commit-graph: close file before returning NULL

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There are two reasons that we could return NULL early within
load_commit_graph_chain():

 1. The file does not exist, so the file pointer is NULL.
 2. The file exists, but is too small to contain a single hash.

These were grouped together when the function was first written in
5c84b3396 (commit-graph: load commit-graph chains, 2019-06-18) in order
to simplify how the 'chain_name' string is freed. However, the current
code leaves a narrow window where the file pointer is not closed when
the file exists, but is rejected for being too small.

Split out these cases separately to ensure we close the file in this
case.

Signed-off-by: Kleber Tarcísio <klebertarcisio@yahoo.com.br>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kleber Tarcísio 2022-04-18 17:13:27 +00:00 committed by Junio C Hamano
parent 6cd33dceed
commit c0befa0c03
1 changed files with 6 additions and 3 deletions
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9
commit-graph.c
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@ -523,10 +523,13 @@ static struct commit_graph *load_commit_graph_chain(struct repository *r,
stat_res = stat(chain_name, &st);
free(chain_name);
if (!fp ||
stat_res ||
st.st_size <= the_hash_algo->hexsz)
if (!fp)
return NULL;
if (stat_res ||
st.st_size <= the_hash_algo->hexsz) {
fclose(fp);
return NULL;
}
count = st.st_size / (the_hash_algo->hexsz + 1);
CALLOC_ARRAY(oids, count);