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commit-graph: close descriptors after mmap 

We don't ever refer to the descriptor after mmap-ing it. And keeping it
open means we can run out of descriptors in degenerate cases (e.g.,
thousands of split chain files). Let's close it as soon as possible.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-04-23 15:41:13 -06:00 committed by Junio C Hamano
parent b78a556a6a
commit c8828530b7
3 changed files with 8 additions and 17 deletions
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15
commit-graph.c
View File

@ -69,7 +69,6 @@ static uint8_t oid_version(void)
static struct commit_graph *alloc_commit_graph(void)
{
struct commit_graph *g = xcalloc(1, sizeof(*g));
g->graph_fd = -1;
return g;
}
@ -123,14 +122,13 @@ struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
return NULL;
}
graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
ret = parse_commit_graph(graph_map, fd, graph_size);
close(fd);
ret = parse_commit_graph(graph_map, graph_size);
if (ret)
ret->odb = odb;
else {
else
munmap(graph_map, graph_size);
close(fd);
}
return ret;
}
@ -165,8 +163,7 @@ static int verify_commit_graph_lite(struct commit_graph *g)
return 0;
}
struct commit_graph *parse_commit_graph(void *graph_map, int fd,
size_t graph_size)
struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size)
{
const unsigned char *data, *chunk_lookup;
uint32_t i;
@ -209,7 +206,6 @@ struct commit_graph *parse_commit_graph(void *graph_map, int fd,
graph->hash_len = the_hash_algo->rawsz;
graph->num_chunks = *(unsigned char*)(data + 6);
graph->graph_fd = fd;
graph->data = graph_map;
graph->data_len = graph_size;
@ -2129,10 +2125,9 @@ void free_commit_graph(struct commit_graph *g)
{
if (!g)
return;
if (g->graph_fd >= 0) {
if (g->data) {
munmap((void *)g->data, g->data_len);
g->data = NULL;
close(g->graph_fd);
}
free(g->filename);
free(g);

5
commit-graph.h
View File

@ -40,8 +40,6 @@ struct tree *get_commit_tree_in_graph(struct repository *r,
const struct commit *c);
struct commit_graph {
int graph_fd;
const unsigned char *data;
size_t data_len;
@ -66,8 +64,7 @@ struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
struct object_directory *odb);
struct commit_graph *read_commit_graph_one(struct repository *r,
struct object_directory *odb);
struct commit_graph *parse_commit_graph(void *graph_map, int fd,
size_t graph_size);
struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size);
/*
* Return 1 if and only if the repository has a commit-graph

5
fuzz-commit-graph.c
View File

@ -1,8 +1,7 @@
#include "commit-graph.h"
#include "repository.h"
struct commit_graph *parse_commit_graph(void *graph_map, int fd,
size_t graph_size);
struct commit_graph *parse_commit_graph(void *graph_map, size_t graph_size);
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
@ -11,7 +10,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
struct commit_graph *g;
initialize_the_repository();
g = parse_commit_graph((void *)data, -1, size);
g = parse_commit_graph((void *)data, size);
repo_clear(the_repository);
free(g);