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authorDan Carpenter <error27@gmail.com>2022-12-07 10:06:31 +0300
committerJakub Kicinski <kuba@kernel.org>2022-12-08 09:09:36 -0800
commitcdd97383e19d4afe29adc3376025a15ae3bab3a3 (patch)
tree5824da88d36abdff7cfc02cc62e072dbc4daf094
parented14e5903638f6eb868e3e2b4e610985e6a6c876 (diff)
downloadlinux-cdd97383e19d4afe29adc3376025a15ae3bab3a3.tar.bz2
net: mvneta: Fix an out of bounds check
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>
-rw-r--r--drivers/net/ethernet/marvell/mvneta.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 66b7f27c9a48..5aefaaff0871 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4271,7 +4271,7 @@ 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();
@@ -4927,9 +4927,6 @@ 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 */