| commit | c793f9cb0853b7b173228efa53b32c60e3818598 | [log] [tgz] |
|---|---|---|
| author | Taylor Blau <me@ttaylorr.com> | Fri May 03 15:12:36 2024 -0400 |
| committer | Junio C Hamano <gitster@pobox.com> | Fri May 03 12:44:16 2024 -0700 |
| tree | b85acec1c0bf62515404f2f130a5fab20aeeb755 | |
| parent | 3c2a3fdc388747b9eaf4a4a4f2035c1c9ddb26d0 [diff] |
attr.c: move ATTR_MAX_FILE_SIZE check into read_attr_from_buf()
Commit 3c50032ff52 (attr: ignore overly large gitattributes files,
2022-12-01) added a defense-in-depth check to ensure that .gitattributes
blobs read from the index do not exceed ATTR_MAX_FILE_SIZE (100 MB).
But there were two cases added shortly after 3c50032ff52 was written
which do not apply similar protections:
- 47cfc9bd7d0 (attr: add flag `--source` to work with tree-ish,
2023-01-14)
- 4723ae1007f (attr.c: read attributes in a sparse directory,
2023-08-11) added a similar
Ensure that we refuse to process a .gitattributes blob exceeding
ATTR_MAX_FILE_SIZE when reading from either an arbitrary tree object or
a sparse directory. This is done by pushing the ATTR_MAX_FILE_SIZE check
down into the low-level `read_attr_from_buf()`.
In doing so, plug a leak in `read_attr_from_index()` where we would
accidentally leak the large buffer upon detecting it is too large to
process.
(Since `read_attr_from_buf()` handles a NULL buffer input, we can remove
a NULL check before calling it in `read_attr_from_index()` as well).
Co-authored-by: Jeff King <peff@peff.net>
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>
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