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attr: harden allocation against integer overflows 

When parsing an attributes line, we need to allocate an array that holds
all attributes specified for the given file pattern. The calculation to
determine the number of bytes that need to be allocated was prone to an
overflow though when there was an unreasonable amount of attributes.

Harden the allocation by instead using the `st_` helper functions that
cause us to die when we hit an integer overflow.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2022-12-01 15:45:40 +01:00 committed by Junio C Hamano
parent e1e12e97ac
commit a60a66e409
1 changed files with 3 additions and 4 deletions
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7
attr.c
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@ -380,10 +380,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
goto fail_return;
}
res = xcalloc(1,
sizeof(*res) +
sizeof(struct attr_state) * num_attr +
(is_macro ? 0 : namelen + 1));
res = xcalloc(1, st_add3(sizeof(*res),
st_mult(sizeof(struct attr_state), num_attr),
is_macro ? 0 : namelen + 1));
if (is_macro) {
res->u.attr = git_attr_internal(name, namelen);
} else {