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qed/qed_dev: guard against a possible division by zero

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[ Upstream commit 1a9dc5610e ]

Previously we would divide total_left_rate by zero if num_vports
happened to be 1 because non_requested_count is calculated as
num_vports - req_count. Guard against this by validating num_vports at
the beginning and returning an error otherwise.

Found by Linux Verification Center (linuxtesting.org) with the SVACE
static analysis tool.

Fixes: bcd197c81f ("qed: Add vport WFQ configuration APIs")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230309201556.191392-1-d-tatianin@yandex-team.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniil Tatianin 2023-03-09 23:15:56 +03:00 committed by Greg Kroah-Hartman
parent b108bd9e6b
commit 6ffa057001
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/qlogic/qed/qed_dev.c
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@ -5022,6 +5022,11 @@ static int qed_init_wfq_param(struct qed_hwfn *p_hwfn,
num_vports = p_hwfn->qm_info.num_vports;
if (num_vports < 2) {
DP_NOTICE(p_hwfn, "Unexpected num_vports: %d\n", num_vports);
return -EINVAL;
}
/* Accounting for the vports which are configured for WFQ explicitly */
for (i = 0; i < num_vports; i++) {
u32 tmp_speed;