Vulnerability CVE-2021-47548
Published: 2024-05-24

Description:
In the Linux kernel, the following vulnerability has been resolved:

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.

 References:
https://git.kernel.org/stable/c/948968f8747650447c8f21c9fdba0e1973be040b
https://git.kernel.org/stable/c/abbd5faa0748d0aa95d5191d56ff7a17a6275bd1
https://git.kernel.org/stable/c/dd07f8971b81ad98cc754b179b331b57f35aa1ff
https://git.kernel.org/stable/c/99bb25cb6753beaf2c2bc37927c2ecc0ceff3f6d
https://git.kernel.org/stable/c/22519eff7df2d88adcc2568d86046ce1e2b52803
https://git.kernel.org/stable/c/fc7ffa7f10b9454a86369405d9814bf141b30627
https://git.kernel.org/stable/c/a66998e0fbf213d47d02813b9679426129d0d114
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