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-rw-r--r--posix/regex.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/posix/regex.c b/posix/regex.c
index ee066b5efa..dc831cecd1 100644
--- a/posix/regex.c
+++ b/posix/regex.c
@@ -1007,7 +1007,7 @@ static const char *re_error_msgid[] =
#endif
/* Roughly the maximum number of failure points on the stack. Would be
- exactly that if always used MAX_FAILURE_SPACE each time we failed.
+ exactly that if always used MAX_FAILURE_ITEMS items each time we failed.
This is a variable only so users of regex can assign to it; we never
change it ourselves. */
#if defined (MATCH_MAY_ALLOCATE)
@@ -1224,7 +1224,10 @@ typedef struct
#endif
/* We push at most this many items on the stack. */
-#define MAX_FAILURE_ITEMS ((num_regs - 1) * NUM_REG_ITEMS + NUM_NONREG_ITEMS)
+/* We used to use (num_regs - 1), which is the number of registers
+ this regexp will save; but that was changed to 5
+ to avoid stack overflow for a regexp with lots of parens. */
+#define MAX_FAILURE_ITEMS (5 * NUM_REG_ITEMS + NUM_NONREG_ITEMS)
/* We actually push this many items. */
#define NUM_FAILURE_ITEMS \