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vim-patch:9.1.0650: Coverity warning in cstrncmp() (#29944)

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Problem:  Coverity warning in cstrncmp()
          (after v9.1.0645)
Solution: Change the type of n2 to int.
          (zeertzjq)

________________________________________________________________________________________________________
*** CID 1615684:  Integer handling issues  (INTEGER_OVERFLOW)
/src/regexp.c: 1757 in cstrncmp()
1751                 n1 -= mb_ptr2len(s1);
1752                 MB_PTR_ADV(p);
1753                 n2++;
1754             }
1755             // count the number of bytes to advance the same number of chars for s2
1756             p = s2;
>>>     CID 1615684:  Integer handling issues  (INTEGER_OVERFLOW)
>>>     Expression "n2--", which is equal to 18446744073709551615, where "n2" is known to be equal to 0, underflows the type that receives it, an unsigned integer 64 bits wide.
1757             while (n2-- > 0 && *p != NUL)
1758                 MB_PTR_ADV(p);
1759
1760             n2 = p - s2;
1761
1762             result = MB_STRNICMP2(s1, s2, *n, n2);

closes: vim/vim#15409

e8feaa354e
This commit is contained in:
zeertzjq 2024-08-02 06:09:23 +08:00 committed by GitHub
parent 720b309c78
commit d65788052f
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GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 5 deletions
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src/nvim/regexp.c
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@ -1743,7 +1743,7 @@ static int cstrncmp(char *s1, char *s2, int *n)
result = strncmp(s1, s2, (size_t)(*n));
} else {
char *p = s1;
size_t n2 = 0;
int n2 = 0;
int n1 = *n;
// count the number of characters for byte-length of s1
while (n1 > 0 && *p != NUL) {
@ -1757,11 +1757,11 @@ static int cstrncmp(char *s1, char *s2, int *n)
MB_PTR_ADV(p);
}
n2 = (size_t)(p - s2);
n2 = (int)(p - s2);
result = utf_strnicmp(s1, s2, (size_t)(*n), n2);
if (result == 0 && (int)n2 < *n) {
*n = (int)n2;
result = utf_strnicmp(s1, s2, (size_t)(*n), (size_t)n2);
if (result == 0 && n2 < *n) {
*n = n2;
}
}