A fuzzer running on the entry point provided by fuzz-commit-graph.c
revealed a memory leak when parse_commit_graph() creates a struct
bloom_filter_settings and then returns early due to error. Fix that
error by always freeing that struct first (if it exists) before
returning early due to error.
While making that change, I also noticed another possible memory leak -
when the BLOOMDATA chunk is provided but not BLOOMINDEXES. Also fix that
error.
Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
---
Here's a memory leak fix revealed by a fuzzer running at $DAYJOB, and
another one that I noticed while making that fix.
---
commit-graph.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/commit-graph.c b/commit-graph.c
index 6dc777e2f3..1694f0a691 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -281,8 +281,7 @@ struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
if (data + graph_size - chunk_lookup <
GRAPH_CHUNKLOOKUP_WIDTH) {
error(_("commit-graph chunk lookup table entry missing; file may be incomplete"));
- free(graph);
- return NULL;
+ goto free_and_return;
}
chunk_id = get_be32(chunk_lookup + 0);
@@ -293,8 +292,7 @@ struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
if (chunk_offset > graph_size - the_hash_algo->rawsz) {
error(_("commit-graph improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
(uint32_t)chunk_offset);
- free(graph);
- return NULL;
+ goto free_and_return;
}
switch (chunk_id) {
@@ -361,8 +359,7 @@ struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
if (chunk_repeated) {
error(_("commit-graph chunk id %08x appears multiple times"), chunk_id);
- free(graph);
- return NULL;
+ goto free_and_return;
}
if (last_chunk_id == GRAPH_CHUNKID_OIDLOOKUP)
@@ -381,17 +378,20 @@ struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
/* We need both the bloom chunks to exist together. Else ignore the data */
graph->chunk_bloom_indexes = NULL;
graph->chunk_bloom_data = NULL;
- graph->bloom_filter_settings = NULL;
+ FREE_AND_NULL(graph->bloom_filter_settings);
}
hashcpy(graph->oid.hash, graph->data + graph->data_len - graph->hash_len);
- if (verify_commit_graph_lite(graph)) {
- free(graph);
- return NULL;
- }
+ if (verify_commit_graph_lite(graph))
+ goto free_and_return;
return graph;
+
+free_and_return:
+ free(graph->bloom_filter_settings);
+ free(graph);
+ return NULL;
}
static struct commit_graph *load_commit_graph_one(const char *graph_file,
--
2.26.2.526.g744177e7f7-goog
