crypto: iaa - Fix nr_cpus < nr_iaa case
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>
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@ -806,6 +806,8 @@ 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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@ -821,10 +823,12 @@ 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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