lldpad: fix using uninitialized value

[liuhangbin]

When the length is less than sizeof(cmd.ifname), the cmd.ifname will be printed uninitialized, which could cause information leakage. Fix this by copying the maximum size of ifname before printing it out.

This issue was found through static code analysis.

Fixes: a37b7e0f3b66 ("lldpad: initial git commit") Fixes: 3b559d8d0b52 ("VDP: vdptool first version")

[liuhangbin]

Instead, the printf() should probably be changed to print the source value from the memcpy for debug purposes

Thanks, the patch updated.

[apconole]

Merged - thanks!