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Remember to reset yy_start state when firing up repl_scanner.l.

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Without this, we get odd behavior when the previous cycle of
lexing exited in a non-default exclusive state.  Every other
copy of this code is aware that it has to do BEGIN(INITIAL),
but repl_scanner.l did not get that memo.

The real-world impact of this is probably limited, since most
replication clients would abandon their connection after getting
a syntax error.  Still, it's a bug.

This mistake is old, so back-patch to all supported branches.

Discussion: https://postgr.es/m/1874781.1643035952@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2022-01-24 12:09:46 -05:00
parent 0cbc507378
commit c94c6612da
1 changed files with 3 additions and 0 deletions
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3
src/backend/replication/repl_scanner.l
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@ -245,6 +245,9 @@ replication_scanner_init(const char *str)
memcpy(scanbuf, str, slen); memcpy(scanbuf, str, slen);
scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR; scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
scanbufhandle = yy_scan_buffer(scanbuf, slen + 2); scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
/* Make sure we start in proper state */
BEGIN(INITIAL);
} }
void void