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| author |   Teng Qi <starmiku1207184332@gmail.com> | 2021-11-17 11:44:53 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-11-18 11:15:47 +0000 |
| commit | a66998e0fbf213d47d02813b9679426129d0d114 (patch) | |
| tree | b11e9a25ab4ca26b0f2c907dcdfeb248ee035870 /drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c | |
| parent | octeontx2-af: debugfs: don't corrupt user memory (diff) | |
| download | linux-dev-a66998e0fbf213d47d02813b9679426129d0d114.tar.xz linux-dev-a66998e0fbf213d47d02813b9679426129d0d114.zip | |
ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port()
The if statement:
if (port >= DSAF_GE_NUM)
return;
limits the value of port less than DSAF_GE_NUM (i.e., 8).
However, if the value of port is 6 or 7, an array overflow could occur:
port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off;
because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6).
To fix this possible array overflow, we first check port and if it is
greater than or equal to DSAF_MAX_PORT_NUM, the function returns.
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Teng Qi <starmiku1207184332@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c index 23d9cbf262c3..740850b64aff 100644 --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c @@ -400,6 +400,10 @@ static void hns_dsaf_ge_srst_by_port(struct dsaf_device *dsaf_dev, u32 port, return; if (!HNS_DSAF_IS_DEBUG(dsaf_dev)) { + /* DSAF_MAX_PORT_NUM is 6, but DSAF_GE_NUM is 8. + We need check to prevent array overflow */ + if (port >= DSAF_MAX_PORT_NUM) + return; reg_val_1 = 0x1 << port; port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; /* there is difference between V1 and V2 in register.*/ |