diff options
Diffstat (limited to 'mysys')
| -rw-r--r-- | mysys/lf_alloc-pin.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/mysys/lf_alloc-pin.c b/mysys/lf_alloc-pin.c index 6ab6ba3aae0..59f60f06696 100644 --- a/mysys/lf_alloc-pin.c +++ b/mysys/lf_alloc-pin.c @@ -103,6 +103,12 @@ #include <my_sys.h> #include <lf.h> +/* + when using alloca() leave at least that many bytes of the stack - + for functions we might be calling from within this stack frame +*/ +#define ALLOCA_SAFETY_MARGIN 8192 + #define LF_PINBOX_MAX_PINS 65536 static void _lf_pinbox_real_free(LF_PINS *pins); @@ -349,7 +355,8 @@ static void _lf_pinbox_real_free(LF_PINS *pins) { int alloca_size= sizeof(void *)*LF_PINBOX_PINS*npins; /* create a sorted list of pinned addresses, to speed up searches */ - if (available_stack_size(&pinbox, *pins->stack_ends_here) > alloca_size) + if (available_stack_size(&pinbox, *pins->stack_ends_here) > + alloca_size + ALLOCA_SAFETY_MARGIN) { struct st_harvester hv; addr= (void **) alloca(alloca_size); |