[postgis-devel] Bug Report issue#4017 lwgeom lexer memory corruption

[宇航 邱]

On PG/PPAS, some sql will cause RDS reboot. And the reason comes from the PostGis. From the coredump, we know wkt_yyrealloc(yy_buffer_stack) caused the problem, which is in liblwgeom/lwin _wkt_lex.c. yy_buffer_stack is a global variable, it was not reseted when a query canceled, when next time realloc it, coredump happens.

The patch of issue 4017 in PostGis didn't fix the bug. Just put a useless patch.
Should add
yy_init_globals(); 
in
void wkt_lexer_init(char *src);
function.

The bug exists in 2.2 2.3 2.4 trunk.
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