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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: #13554
closes: #13555

Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Christian Brabandt
2023-11-22 22:18:35 +01:00
parent 26c11c5688
commit 3770574e4a
4 changed files with 69 additions and 41 deletions
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90
src/cindent.c
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@@ -1730,10 +1730,17 @@ parse_cino(buf_T *buf)
char_u *p;
char_u *l;
char_u *digits;
int n;
long long n;
int divider;
int fraction = 0;
int sw = (int)get_sw_value(buf);
int sw;
long long t = get_sw_value(buf);
// needed for cino-(, it will be multiplied by 2 again
if (t > INT_MAX / 2)
sw = INT_MAX / 2;
else
sw = (int)t;
// Set the default values.
@@ -1902,47 +1909,52 @@ parse_cino(buf_T *buf)
if (l[1] == '-')
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; break;
case 'e': buf->b_ind_open_imag = n; break;
case 'n': buf->b_ind_no_brace = n; break;
case 'f': buf->b_ind_first_open = n; break;
case '{': buf->b_ind_open_extra = n; break;
case '}': buf->b_ind_close_extra = n; break;
case '^': buf->b_ind_open_left_imag = n; break;
case 'L': buf->b_ind_jump_label = n; break;
case ':': buf->b_ind_case = n; break;
case '=': buf->b_ind_case_code = n; break;
case 'b': buf->b_ind_case_break = n; break;
case 'p': buf->b_ind_param = n; break;
case 't': buf->b_ind_func_type = n; break;
case '/': buf->b_ind_comment = n; break;
case 'c': buf->b_ind_in_comment = n; break;
case 'C': buf->b_ind_in_comment2 = n; break;
case 'i': buf->b_ind_cpp_baseclass = n; break;
case '+': buf->b_ind_continuation = n; break;
case '(': buf->b_ind_unclosed = n; break;
case 'u': buf->b_ind_unclosed2 = n; break;
case 'U': buf->b_ind_unclosed_noignore = n; break;
case 'W': buf->b_ind_unclosed_wrapped = n; break;
case 'w': buf->b_ind_unclosed_whiteok = n; break;
case 'm': buf->b_ind_matching_paren = n; break;
case 'M': buf->b_ind_paren_prev = n; break;
case ')': buf->b_ind_maxparen = n; break;
case '*': buf->b_ind_maxcomment = n; break;
case 'g': buf->b_ind_scopedecl = n; break;
case 'h': buf->b_ind_scopedecl_code = n; break;
case 'j': buf->b_ind_java = n; break;
case 'J': buf->b_ind_js = n; break;
case 'l': buf->b_ind_keep_case_label = n; break;
case '#': buf->b_ind_hash_comment = n; break;
case 'N': buf->b_ind_cpp_namespace = n; break;
case 'k': buf->b_ind_if_for_while = n; break;
case 'E': buf->b_ind_cpp_extern_c = n; break;
case 'P': buf->b_ind_pragma = n; break;
case '>': buf->b_ind_level = (int)n; break;
case 'e': buf->b_ind_open_imag = (int)n; break;
case 'n': buf->b_ind_no_brace = (int)n; break;
case 'f': buf->b_ind_first_open = (int)n; break;
case '{': buf->b_ind_open_extra = (int)n; break;
case '}': buf->b_ind_close_extra = (int)n; break;
case '^': buf->b_ind_open_left_imag = (int)n; break;
case 'L': buf->b_ind_jump_label = (int)n; break;
case ':': buf->b_ind_case = (int)n; break;
case '=': buf->b_ind_case_code = (int)n; break;
case 'b': buf->b_ind_case_break = (int)n; break;
case 'p': buf->b_ind_param = (int)n; break;
case 't': buf->b_ind_func_type = (int)n; break;
case '/': buf->b_ind_comment = (int)n; break;
case 'c': buf->b_ind_in_comment = (int)n; break;
case 'C': buf->b_ind_in_comment2 = (int)n; break;
case 'i': buf->b_ind_cpp_baseclass = (int)n; break;
case '+': buf->b_ind_continuation = (int)n; break;
case '(': buf->b_ind_unclosed = (int)n; break;
case 'u': buf->b_ind_unclosed2 = (int)n; break;
case 'U': buf->b_ind_unclosed_noignore = (int)n; break;
case 'W': buf->b_ind_unclosed_wrapped = (int)n; break;
case 'w': buf->b_ind_unclosed_whiteok = (int)n; break;
case 'm': buf->b_ind_matching_paren = (int)n; break;
case 'M': buf->b_ind_paren_prev = (int)n; break;
case ')': buf->b_ind_maxparen = (int)n; break;
case '*': buf->b_ind_maxcomment = (int)n; break;
case 'g': buf->b_ind_scopedecl = (int)n; break;
case 'h': buf->b_ind_scopedecl_code = (int)n; break;
case 'j': buf->b_ind_java = (int)n; break;
case 'J': buf->b_ind_js = (int)n; break;
case 'l': buf->b_ind_keep_case_label = (int)n; break;
case '#': buf->b_ind_hash_comment = (int)n; break;
case 'N': buf->b_ind_cpp_namespace = (int)n; break;
case 'k': buf->b_ind_if_for_while = (int)n; break;
case 'E': buf->b_ind_cpp_extern_c = (int)n; break;
case 'P': buf->b_ind_pragma = (int)n; break;
}
if (*p == ',')
++p;