From: Dan Carpenter error27@gmail.com
stable inclusion from stable-4.19.269 commit 3861eee36e8d5865eb0d53d4db890529eb7fce7c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRDU CVE: CVE-2022-48966
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit cdd97383e19d4afe29adc3376025a15ae3bab3a3 ]
In an earlier commit, I added a bounds check to prevent an out of bounds read and a WARN(). On further discussion and consideration that check was probably too aggressive. Instead of returning -EINVAL, a better fix would be to just prevent the out of bounds read but continue the process.
Background: The value of "pp->rxq_def" is a number between 0-7 by default, or even higher depending on the value of "rxq_number", which is a module parameter. If the value is more than the number of available CPUs then it will trigger the WARN() in cpu_max_bits_warn().
Fixes: e8b4fc13900b ("net: mvneta: Prevent out of bounds read in mvneta_config_rss()") Signed-off-by: Dan Carpenter error27@gmail.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Link: https://lore.kernel.org/r/Y5A7d1E5ccwHTYPf@kadam Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zeng Heng zengheng4@huawei.com --- drivers/net/ethernet/marvell/mvneta.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 355eaedcaea5..337919fbaefe 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -3604,7 +3604,7 @@ static void mvneta_percpu_elect(struct mvneta_port *pp) /* Use the cpu associated to the rxq when it is online, in all * the other cases, use the cpu 0 which can't be offline. */ - if (cpu_online(pp->rxq_def)) + if (pp->rxq_def < nr_cpu_ids && cpu_online(pp->rxq_def)) elected_cpu = pp->rxq_def;
max_cpu = num_present_cpus(); @@ -4120,9 +4120,6 @@ static int mvneta_config_rss(struct mvneta_port *pp) napi_disable(&pp->napi); }
- if (pp->indir[0] >= nr_cpu_ids) - return -EINVAL; - pp->rxq_def = pp->indir[0];
/* Update unicast mapping */