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Prevent potential buffer overrun in onigmo

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A code pattern `p + enclen(enc, p, pend)` may lead to a buffer overrun
if incomplete bytes of a UTF-8 character is placed at the end of a
string. Because this pattern is used in several places in onigmo,
this change fixes the issue in the side of `enclen`: the function should
not return a number that is larger than `pend - p`.

Co-Authored-By: Nobuyoshi Nakada <nobu@ruby-lang.org>
This commit is contained in:
Yusuke Endoh 2022-10-25 15:45:40 +09:00
parent 114e71d062
commit 1d2d25dcad
Notes: git 2022-10-25 08:03:04 +00:00
3 changed files with 17 additions and 3 deletions
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4
include/ruby/onigmo.h
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@ -356,9 +356,9 @@ int onigenc_ascii_only_case_map(OnigCaseFoldType* flagP, const OnigUChar** pp, c
#define ONIGENC_PRECISE_MBC_ENC_LEN(enc,p,e) (enc)->precise_mbc_enc_len(p,e,enc)
ONIG_EXTERN
int onigenc_mbclen_approximate(const OnigUChar* p,const OnigUChar* e, const struct OnigEncodingTypeST* enc);
int onigenc_mbclen(const OnigUChar* p,const OnigUChar* e, const struct OnigEncodingTypeST* enc);
#define ONIGENC_MBC_ENC_LEN(enc,p,e) onigenc_mbclen_approximate(p,e,enc)
#define ONIGENC_MBC_ENC_LEN(enc,p,e) onigenc_mbclen(p,e,enc)
#define ONIGENC_MBC_MAXLEN(enc) ((enc)->max_enc_len)
#define ONIGENC_MBC_MAXLEN_DIST(enc) ONIGENC_MBC_MAXLEN(enc)
#define ONIGENC_MBC_MINLEN(enc) ((enc)->min_enc_len)