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config: handle realloc issues from larger depths

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As the include depth increases, the chance of a realloc
increases. This means that whenever we run git_array_alloc() or call
config_parse(), we need to remember what our reader's index is so we
can look it up again.
This commit is contained in:
Carlos Martín Nieto 2013-09-07 19:07:39 +02:00
parent 6978992298
commit 53ea051371
2 changed files with 23 additions and 0 deletions
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9
src/config_file.c
View File

@ -191,6 +191,7 @@ static int config_open(git_config_backend *cfg, git_config_level_t level)
b->values = NULL;
}
reader = git_array_get(b->readers, 0);
git_buf_free(&reader->buffer);
return res;
}
@ -948,12 +949,14 @@ static int config_parse(diskfile_backend *cfg_file, struct reader *reader, git_c
git_buf buf = GIT_BUF_INIT;
int result = 0;
khiter_t pos;
uint32_t reader_idx;
if (depth >= MAX_INCLUDE_DEPTH) {
giterr_set(GITERR_CONFIG, "Maximum config include depth reached");
return -1;
}
reader_idx = git_array_size(cfg_file->readers) - 1;
/* Initialize the reading position */
reader->read_ptr = reader->buffer.ptr;
reader->eof = 0;
@ -1027,12 +1030,17 @@ static int config_parse(diskfile_backend *cfg_file, struct reader *reader, git_c
struct reader *r;
git_buf path = GIT_BUF_INIT;
char *dir;
uint32_t index;
r = git_array_alloc(cfg_file->readers);
/* The reader may have been reallocated */
reader = git_array_get(cfg_file->readers, reader_idx);
memset(r, 0, sizeof(struct reader));
if ((result = git_path_dirname_r(&path, reader->file_path)) < 0)
break;
/* We need to know out index in the array, as the next config_parse call may realloc */
index = git_array_size(cfg_file->readers) - 1;
dir = git_buf_detach(&path);
result = included_path(&path, dir, var->entry->value);
git__free(dir);
@ -1047,6 +1055,7 @@ static int config_parse(diskfile_backend *cfg_file, struct reader *reader, git_c
break;
result = config_parse(cfg_file, r, level, depth+1);
r = git_array_get(cfg_file->readers, index);
git_buf_free(&r->buffer);
if (result < 0)

14
tests-clar/config/include.c
View File

@ -93,3 +93,17 @@ void test_config_include__ordering(void)
git_config_free(cfg);
}
/* We need to pretend that the variables were defined where the file was included */
void test_config_include__depth(void)
{
git_config *cfg;
cl_git_mkfile("a", "[include]\npath = b");
cl_git_mkfile("b", "[include]\npath = a");
cl_git_fail(git_config_open_ondisk(&cfg, "a"));
unlink("a");
unlink("b");
}