@leroysheep / MovieWebApp / commits / 6593e147d3

reftable/basics: handle allocation failures in `reftable_calloc()`

Handle allocation failures in `reftable_calloc()`. While at it, remove our use of `st_mult()` that would cause us to die on an overflow. From the caller's point of view there is not much of a difference between arguments that are too large to be multiplied and a request that is too big to handle by the allocator: in both cases the allocation cannot be fulfilled. And in neither of these cases do we want the reftable library to die. While we could use `unsigned_mult_overflows()` to handle the overflow gracefully, we instead open-code it to further our goal of converting the reftable codebase to become a standalone library that can be reused by external projects. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Patrick Steinhardt committed Oct 2, 2024 at 12:55 UTC 6593e147d3992eb52cb53b6f8a09dc3e10f79613

1 file changed +10 -3

reftable/basics.c

+10 -3

index 4adc98cf5d..3350bbffa2 100644 --- a/reftable/basics.c +++ b/reftable/basics.c @@ -37,9 +37,16 @@ void reftable_free(void *p) void *reftable_calloc(size_t nelem, size_t elsize) { - size_t sz = st_mult(nelem, elsize); - void *p = reftable_malloc(sz); - memset(p, 0, sz); + void *p; + + if (nelem && elsize > SIZE_MAX / nelem) + return NULL; + + p = reftable_malloc(nelem * elsize); + if (!p) + return NULL; + + memset(p, 0, nelem * elsize); return p; }