diff options
Diffstat (limited to 'rts/sm/Storage.c')
| -rw-r--r-- | rts/sm/Storage.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/rts/sm/Storage.c b/rts/sm/Storage.c index 86bd1c2bb3..379d9da769 100644 --- a/rts/sm/Storage.c +++ b/rts/sm/Storage.c @@ -686,7 +686,15 @@ StgPtr allocate (Capability *cap, W_ n) CCS_ALLOC(cap->r.rCCCS,n); if (n >= LARGE_OBJECT_THRESHOLD/sizeof(W_)) { - W_ req_blocks = (W_)BLOCK_ROUND_UP(n*sizeof(W_)) / BLOCK_SIZE; + // The largest number of words such that + // the computation of req_blocks will not overflow. + W_ max_words = (HS_WORD_MAX & ~(BLOCK_SIZE-1)) / sizeof(W_); + W_ req_blocks; + + if (n > max_words) + req_blocks = HS_WORD_MAX; // signal overflow below + else + req_blocks = (W_)BLOCK_ROUND_UP(n*sizeof(W_)) / BLOCK_SIZE; // Attempting to allocate an object larger than maxHeapSize // should definitely be disallowed. (bug #1791) |