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vim-patch:9.0.2122: [security]: prevent overflow in indenting

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Problem:  [security]: prevent overflow in indenting
Solution: use long long and remove cast to (int)

The shiftwidth option values are defined as being long. However, when
calculating the actual amount of indent, we cast down to (int), which
may cause the shiftwidth value to become negative and later it may even
cause Vim to try to allocate a huge amount of memory.

We already use long and long long variable types to calculate the indent
(and detect possible overflows), so the cast to (int) seems superfluous
and can be safely removed. So let's just remove the (int) cast and
calculate the indent using longs.

Additionally, the 'shiftwidth' option value is also used when determining
the actual 'cino' options. There it can again cause another overflow, so
make sure it is safe in parse_cino() as well.

fixes: vim/vim#13554
closes: vim/vim#13555

3770574e4a

Co-authored-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-12-10 13:52:40 +08:00
parent ac230370f3
commit 7a7ed0c8ac
2 changed files with 59 additions and 38 deletions
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82
src/nvim/indent_c.c
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@@ -1689,7 +1689,7 @@ void parse_cino(buf_T *buf)
p++;
}
char *digits_start = p; // remember where the digits start
int n = getdigits_int(&p, true, 0);
int64_t n = getdigits_int(&p, true, 0);
divider = 0;
if (*p == '.') { // ".5s" means a fraction.
fraction = atoi(++p);
@@ -1717,119 +1717,125 @@ void parse_cino(buf_T *buf)
n = -n;
}
if (n > INT_MAX) {
n = INT_MAX;
} else if (n < INT_MIN) {
n = INT_MIN;
}
// When adding an entry here, also update the default 'cinoptions' in
// doc/indent.txt, and add explanation for it!
switch (*l) {
case '>':
buf->b_ind_level = n;
buf->b_ind_level = (int)n;
break;
case 'e':
buf->b_ind_open_imag = n;
buf->b_ind_open_imag = (int)n;
break;
case 'n':
buf->b_ind_no_brace = n;
buf->b_ind_no_brace = (int)n;
break;
case 'f':
buf->b_ind_first_open = n;
buf->b_ind_first_open = (int)n;
break;
case '{':
buf->b_ind_open_extra = n;
buf->b_ind_open_extra = (int)n;
break;
case '}':
buf->b_ind_close_extra = n;
buf->b_ind_close_extra = (int)n;
break;
case '^':
buf->b_ind_open_left_imag = n;
buf->b_ind_open_left_imag = (int)n;
break;
case 'L':
buf->b_ind_jump_label = n;
buf->b_ind_jump_label = (int)n;
break;
case ':':
buf->b_ind_case = n;
buf->b_ind_case = (int)n;
break;
case '=':
buf->b_ind_case_code = n;
buf->b_ind_case_code = (int)n;
break;
case 'b':
buf->b_ind_case_break = n;
buf->b_ind_case_break = (int)n;
break;
case 'p':
buf->b_ind_param = n;
buf->b_ind_param = (int)n;
break;
case 't':
buf->b_ind_func_type = n;
buf->b_ind_func_type = (int)n;
break;
case '/':
buf->b_ind_comment = n;
buf->b_ind_comment = (int)n;
break;
case 'c':
buf->b_ind_in_comment = n;
buf->b_ind_in_comment = (int)n;
break;
case 'C':
buf->b_ind_in_comment2 = n;
buf->b_ind_in_comment2 = (int)n;
break;
case 'i':
buf->b_ind_cpp_baseclass = n;
buf->b_ind_cpp_baseclass = (int)n;
break;
case '+':
buf->b_ind_continuation = n;
buf->b_ind_continuation = (int)n;
break;
case '(':
buf->b_ind_unclosed = n;
buf->b_ind_unclosed = (int)n;
break;
case 'u':
buf->b_ind_unclosed2 = n;
buf->b_ind_unclosed2 = (int)n;
break;
case 'U':
buf->b_ind_unclosed_noignore = n;
buf->b_ind_unclosed_noignore = (int)n;
break;
case 'W':
buf->b_ind_unclosed_wrapped = n;
buf->b_ind_unclosed_wrapped = (int)n;
break;
case 'w':
buf->b_ind_unclosed_whiteok = n;
buf->b_ind_unclosed_whiteok = (int)n;
break;
case 'm':
buf->b_ind_matching_paren = n;
buf->b_ind_matching_paren = (int)n;
break;
case 'M':
buf->b_ind_paren_prev = n;
buf->b_ind_paren_prev = (int)n;
break;
case ')':
buf->b_ind_maxparen = n;
buf->b_ind_maxparen = (int)n;
break;
case '*':
buf->b_ind_maxcomment = n;
buf->b_ind_maxcomment = (int)n;
break;
case 'g':
buf->b_ind_scopedecl = n;
buf->b_ind_scopedecl = (int)n;
break;
case 'h':
buf->b_ind_scopedecl_code = n;
buf->b_ind_scopedecl_code = (int)n;
break;
case 'j':
buf->b_ind_java = n;
buf->b_ind_java = (int)n;
break;
case 'J':
buf->b_ind_js = n;
buf->b_ind_js = (int)n;
break;
case 'l':
buf->b_ind_keep_case_label = n;
buf->b_ind_keep_case_label = (int)n;
break;
case '#':
buf->b_ind_hash_comment = n;
buf->b_ind_hash_comment = (int)n;
break;
case 'N':
buf->b_ind_cpp_namespace = n;
buf->b_ind_cpp_namespace = (int)n;
break;
case 'k':
buf->b_ind_if_for_while = n;
buf->b_ind_if_for_while = (int)n;
break;
case 'E':
buf->b_ind_cpp_extern_c = n;
buf->b_ind_cpp_extern_c = (int)n;
break;
case 'P':
buf->b_ind_pragma = n;
buf->b_ind_pragma = (int)n;
break;
}
if (*p == ',') {