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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2023-06-24 17:18:08 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2023-06-24 17:18:08 -0400 |
| commit | 3b4580f5ce984e8c47ed5932b196c83931c9ed8c (patch) | |
| tree | 865a044fdfe00bb3581330fd5e6e4680a2c28220 /src | |
| parent | 265c9138da58ae6d37dc5324e51d6fc782fe8923 (diff) | |
| download | postgresql-3b4580f5ce984e8c47ed5932b196c83931c9ed8c.tar.gz postgresql-3b4580f5ce984e8c47ed5932b196c83931c9ed8c.zip | |
Check for interrupts and stack overflow in TParserGet().
TParserGet() recurses for some token types, meaning it's possible
to drive it to stack overflow. Since this is a minority behavior,
I chose to add the check_stack_depth() call to the two places that
recurse rather than doing it during every single call.
While at it, add CHECK_FOR_INTERRUPTS(), because this can run
unpleasantly long for long inputs.
Per bug #17995 from Zuming Jiang. This is old, so back-patch
to all supported branches.
Discussion: https://postgr.es/m/17995-9f20ff3e6389db4c@postgresql.org
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/tsearch/wparser_def.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/backend/tsearch/wparser_def.c b/src/backend/tsearch/wparser_def.c index 7fd3a20400e..f307fd1e17b 100644 --- a/src/backend/tsearch/wparser_def.c +++ b/src/backend/tsearch/wparser_def.c @@ -18,6 +18,7 @@ #include "catalog/pg_collation.h" #include "commands/defrem.h" +#include "miscadmin.h" #include "tsearch/ts_locale.h" #include "tsearch/ts_public.h" #include "tsearch/ts_type.h" @@ -639,6 +640,12 @@ p_ishost(TParser *prs) tmpprs->wanthost = true; + /* + * Check stack depth before recursing. (Since TParserGet() doesn't + * normally recurse, we put the cost of checking here not there.) + */ + check_stack_depth(); + if (TParserGet(tmpprs) && tmpprs->type == HOST) { prs->state->posbyte += tmpprs->lenbytetoken; @@ -662,6 +669,12 @@ p_isURLPath(TParser *prs) tmpprs->state = newTParserPosition(tmpprs->state); tmpprs->state->state = TPS_InURLPathFirst; + /* + * Check stack depth before recursing. (Since TParserGet() doesn't + * normally recurse, we put the cost of checking here not there.) + */ + check_stack_depth(); + if (TParserGet(tmpprs) && tmpprs->type == URLPATH) { prs->state->posbyte += tmpprs->lenbytetoken; @@ -1705,6 +1718,8 @@ TParserGet(TParser *prs) { const TParserStateActionItem *item = NULL; + CHECK_FOR_INTERRUPTS(); + Assert(prs->state); if (prs->state->posbyte >= prs->lenstr) |