crypto: iaa - Fix nr_cpus < nr_iaa case
commit 5a7e89d331
upstream.
If nr_cpus < nr_iaa, the calculated cpus_per_iaa will be 0, which
causes a divide-by-0 in rebalance_wq_table().
Make sure cpus_per_iaa is 1 in that case, and also in the nr_iaa == 0
case, even though cpus_per_iaa is never used if nr_iaa == 0, for
paranoia.
Cc: <stable@vger.kernel.org> # v6.8+
Reported-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -908,6 +908,8 @@ static int save_iaa_wq(struct idxd_wq *wq)
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return -EINVAL;
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cpus_per_iaa = (nr_nodes * nr_cpus_per_node) / nr_iaa;
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if (!cpus_per_iaa)
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cpus_per_iaa = 1;
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out:
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return 0;
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}
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@ -923,10 +925,12 @@ static void remove_iaa_wq(struct idxd_wq *wq)
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}
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}
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if (nr_iaa)
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if (nr_iaa) {
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cpus_per_iaa = (nr_nodes * nr_cpus_per_node) / nr_iaa;
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else
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cpus_per_iaa = 0;
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if (!cpus_per_iaa)
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cpus_per_iaa = 1;
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} else
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cpus_per_iaa = 1;
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}
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static int wq_table_add_wqs(int iaa, int cpu)
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