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void integer overflow on computation of refquota_slack

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DMU_MAX_ACCESS should be cast to a uint64_t otherwise the
multiplication of DMU_MAX_ACCESS with spa_asize_inflation will
be 32 bit and may lead to an overflow. Currently DMU_MAX_ACCESS
is 64 * 1024 * 1024, so spa_asize_inflation being 64 or more will
lead to an overflow.

Found by static analysis with CoverityScan 0.8.5

CID 150942 (#1 of 1): Unintentional integer overflow
  (OVERFLOW_BEFORE_WIDEN)
overflow_before_widen: Potentially overflowing expression
  67108864 * spa_asize_inflation with type int (32 bits, signed)
  is evaluated using 32-bit arithmetic, and then used in a context
  that expects an expression of type uint64_t (64 bits, unsigned).

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4889
This commit is contained in:
Colin Ian King 2016-07-27 09:26:38 +01:00 committed by Brian Behlendorf
parent 8a39abaafa
commit bf18fd89f9
1 changed files with 2 additions and 1 deletions
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3
module/zfs/dsl_dataset.c
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@ -2836,7 +2836,8 @@ dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
* "slack" factor for received datasets with refquota set on them.
* See the bottom of this function for details on its use.
*/
uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation;
uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS *
spa_asize_inflation;
int64_t unused_refres_delta;
/* they should both be heads */