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| author | Joel Granados <j.granados@samsung.com> | 2024-05-01 12:29:32 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-05-03 15:29:43 +0300 |
| commit | 78a7b5dbc0609b8c395f754953a45db687cb05e6 (patch) | |
| tree | 1c8e0ff4a070663f45fe62e6995df88f19773c91 /net/ax25/sysctl_net_ax25.c | |
| parent | e00e35e217c0fb5f614cdeb86f28fd3a1c9c936e (diff) | |
| download | linux-78a7b5dbc0609b8c395f754953a45db687cb05e6.tar.xz | |
ax.25: x.25: Remove the now superfluous sentinel elements from ctl_table array
This commit comes at the tail end of a greater effort to remove the
empty elements at the end of the ctl_table arrays (sentinels) which will
reduce the overall build time size of the kernel and run time memory
bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)
Avoid a buffer overflow when traversing the ctl_table by ensuring that
AX25_MAX_VALUES is the same as the size of ax25_param_table. This is
done with a BUILD_BUG_ON where ax25_param_table is defined and a
CONFIG_AX25_DAMA_SLAVE guard in the unnamed enum definition as well as
in the ax25_dev_device_up and ax25_ds_set_timer functions.
The overflow happened when the sentinel was removed from
ax25_param_table. The sentinel's data element was changed when
CONFIG_AX25_DAMA_SLAVE was undefined. This had no adverse effects as it
still stopped on the sentinel's null procname but needed to be addressed
once the sentinel was removed.
Signed-off-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ax25/sysctl_net_ax25.c')
| -rw-r--r-- | net/ax25/sysctl_net_ax25.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c index e0128dc9def3..68753aa30334 100644 --- a/net/ax25/sysctl_net_ax25.c +++ b/net/ax25/sysctl_net_ax25.c @@ -141,8 +141,6 @@ static const struct ctl_table ax25_param_table[] = { .extra2 = &max_ds_timeout }, #endif - - { } /* that's all, folks! */ }; int ax25_register_dev_sysctl(ax25_dev *ax25_dev) @@ -155,6 +153,7 @@ int ax25_register_dev_sysctl(ax25_dev *ax25_dev) if (!table) return -ENOMEM; + BUILD_BUG_ON(ARRAY_SIZE(ax25_param_table) != AX25_MAX_VALUES); for (k = 0; k < AX25_MAX_VALUES; k++) table[k].data = &ax25_dev->values[k]; |