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config: handle allocation failures in config_list - #7429
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cristianchiriac wants to merge 2 commits into
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cristianchiriac wants to merge 2 commits into
cristianchiriac wants to merge 2 commits into
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git_config_list_append did not check the allocation of a new map head, so it stored NULL in the map and then wrote through it. It now allocates the list entry first and frees both on failure, which leaves the map unchanged. git_config_list_dup did not keep the error from duplicating an entry, so it freed the partial list and returned 0 without setting *out. Fixes libgit2#7416 Fixes libgit2#7417
The allocation-failure sweep in config::oom also hits error paths that returned without freeing what they had allocated, which leak checkers in CI report: - git_config_list_dup_entry returned early on a failed strdup and skipped its cleanup; git_config_list_add_string leaked the string when it could not be added to the map - git_config_backend_from_file leaked the backend when the path could not be duplicated - read_on_variable leaked the name buffer and the entry, including when git_config_list_append failed - parse_section_header leaked the line when the name allocation failed The test now wraps the default allocator rather than the standard one, so that builds with DEBUG_STRICT_ALLOC free with the allocator they allocated with.
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The leak checkers flagged leaks on existing OOM error paths in config_file.c and config_parse.c that the new test reaches, plus an allocator mismatch under DEBUG_STRICT_ALLOC. I've fixed both in 1d00d6f; I can split the config_file/config_parse leak fixes into their own PR if you'd prefer. |
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Fixes #7416. Fixes #7417.
Both issues are in
src/libgit2/config_list.c, and an allocation-failure sweep over opening and snapshotting a config hits both, so they're fixed together:git_config_list_append: thegit__callocof a new map head wasn't checked. On failure,NULLwent into the map and was then written through. The list entry is now allocated first. If the map head allocation or theheadmap_putfails, both are freed and the map is left unchanged. Before, a failed list allocation also left the map pointing at an entry that the caller then freed.git_config_list_dup: the result ofgit_config_list_dup_entrywasn't assigned toerror. On failure, the partial list was freed and the function returned 0 without setting*out.Test:
config::oom::open_and_snapshot_fail_or_succeedwrites a small config with a multivar and a subsection. It then opens the config, snapshots it and reads two values, with an allocator that fails the Nth allocation. It does this for every N until no allocation fails. Each run must either report an error or return the values in the file. This is the same pattern asblame::oomin #7425.All tests in
-sconfigpass (MinGW gcc 16, Windows 11).