Fix lookbehind within lookahead within lookbehind misbehaviour bug.
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Philip.Hazel
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66811c6c73
commit
046c5cd21c
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@ -90,6 +90,11 @@ Clusterfuzz issue 15636.
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18. Implement non-atomic positive lookaround assertions.
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19. If a lookbehind contained a lookahead that contained another lookbehind
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within it, the nested lookbehind was not correctly processed. For example, if
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/(?<=(?=(?<=a)))b/ was matched to "ab" it gave no match instead of matching
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"b".
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Version 10.33 16-April-2019
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---------------------------
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@ -135,6 +135,8 @@ static BOOL
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set_lookbehind_lengths(uint32_t **, int *, int *, int *,
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parsed_recurse_check *, compile_block *);
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static int
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check_lookbehinds(uint32_t *, uint32_t **, compile_block *);
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/*************************************************
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@ -9108,16 +9110,16 @@ for (;; pptr++)
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}
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break;
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/* Lookaheads can be ignored, but we must start the skip inside the group
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so that it isn't treated as a group within the branch. */
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/* Lookaheads do not contribute to the length of this branch, but they may
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contain lookbehinds within them whose lengths need to be set. */
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case META_LOOKAHEAD:
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case META_LOOKAHEADNOT:
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case META_LOOKAHEAD_NA:
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pptr = parsed_skip(pptr + 1, PSKIP_KET);
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if (pptr == NULL) goto PARSED_SKIP_FAILED;
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*errcodeptr = check_lookbehinds(pptr + 1, &pptr, cb);
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if (*errcodeptr != 0) return -1;
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/* Also ignore any qualifiers that follow a lookahead assertion. */
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/* Ignore any qualifiers that follow a lookahead assertion. */
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switch (pptr[1])
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{
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@ -9454,21 +9456,29 @@ set_lookbehind_lengths() for each one. At the start, the errorcode is zero and
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the error offset is marked unset. The enables the functions above not to
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override settings from deeper nestings.
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Arguments cb points to the compile block
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This function is called recursively from get_branchlength() for lookaheads in
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order to process any lookbehinds that they may contain. It stops when it hits a
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non-nested closing parenthesis in this case, returning a pointer to it.
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Arguments
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pptr points to where to start (start of pattern or start of lookahead)
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retptr if not NULL, return the ket pointer here
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cb points to the compile block
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Returns: 0 on success, or an errorcode (cb->erroroffset will be set)
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*/
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static int
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check_lookbehinds(compile_block *cb)
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check_lookbehinds(uint32_t *pptr, uint32_t **retptr, compile_block *cb)
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{
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uint32_t *pptr;
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int max;
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int errorcode = 0;
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int loopcount = 0;
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int nestlevel = 0;
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cb->erroroffset = PCRE2_UNSET;
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for (pptr = cb->parsed_pattern; *pptr != META_END; pptr++)
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for (; *pptr != META_END; pptr++)
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{
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if (*pptr < META_END) continue; /* Literal */
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@ -9482,14 +9492,31 @@ for (pptr = cb->parsed_pattern; *pptr != META_END; pptr++)
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pptr += 1;
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break;
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case META_KET:
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if (--nestlevel < 0)
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{
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if (retptr != NULL) *retptr = pptr;
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return 0;
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}
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break;
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case META_ATOMIC:
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case META_CAPTURE:
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case META_COND_ASSERT:
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case META_LOOKAHEAD:
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case META_LOOKAHEADNOT:
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case META_LOOKAHEAD_NA:
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case META_NOCAPTURE:
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case META_SCRIPT_RUN:
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nestlevel++;
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break;
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case META_ACCEPT:
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case META_ALT:
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case META_ASTERISK:
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case META_ASTERISK_PLUS:
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case META_ASTERISK_QUERY:
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case META_ATOMIC:
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case META_BACKREF:
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case META_CAPTURE:
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case META_CIRCUMFLEX:
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case META_CLASS:
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case META_CLASS_EMPTY:
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@ -9497,15 +9524,9 @@ for (pptr = cb->parsed_pattern; *pptr != META_END; pptr++)
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case META_CLASS_END:
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case META_CLASS_NOT:
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case META_COMMIT:
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case META_COND_ASSERT:
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case META_DOLLAR:
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case META_DOT:
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case META_FAIL:
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case META_KET:
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case META_LOOKAHEAD:
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case META_LOOKAHEADNOT:
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case META_LOOKAHEAD_NA:
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case META_NOCAPTURE:
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case META_PLUS:
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case META_PLUS_PLUS:
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case META_PLUS_QUERY:
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@ -9515,7 +9536,6 @@ for (pptr = cb->parsed_pattern; *pptr != META_END; pptr++)
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case META_QUERY_QUERY:
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case META_RANGE_ESCAPED:
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case META_RANGE_LITERAL:
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case META_SCRIPT_RUN:
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case META_SKIP:
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case META_THEN:
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break;
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@ -10021,7 +10041,7 @@ lengths. */
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if (has_lookbehind)
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{
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errorcode = check_lookbehinds(&cb);
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errorcode = check_lookbehinds(cb.parsed_pattern, NULL, &cb);
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if (errorcode != 0) goto HAD_CB_ERROR;
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}
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@ -6377,4 +6377,10 @@ ef) x/x,mark
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/(?<=a(*SKIP)x)|d/
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abcd
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/(?<=(?=.(?<=x)))/aftertext
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abx
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/(?<=(?=(?<=a)))b/
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ab
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# End of testinput1
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@ -5690,4 +5690,7 @@ a)"xI
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# ----
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/(?<=(?=.(?<=x)))/
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ab\=ph
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# End of testinput2
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@ -10097,4 +10097,13 @@ No match
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abcd
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0: d
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/(?<=(?=.(?<=x)))/aftertext
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abx
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0:
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0+ x
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/(?<=(?=(?<=a)))b/
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ab
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0: b
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# End of testinput1
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@ -17185,6 +17185,10 @@ Subject length lower bound = 1
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# ----
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/(?<=(?=.(?<=x)))/
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ab\=ph
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No match
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# End of testinput2
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Error -70: PCRE2_ERROR_BADDATA (unknown error number)
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Error -62: bad serialized data
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