Ben Hutchings ee9c5cfad2
niu: Fix kernel buffer overflow for ETHTOOL_GRXCLSRLALL ...
niu_get_ethtool_tcam_all() assumes that its output buffer is the right
size, and warns before returning if it is not. However, the output
buffer size is under user control and ETHTOOL_GRXCLSRLALL is an
unprivileged ethtool command. Therefore this is at least a local
denial-of-service vulnerability.
Change it to check before writing each entry and to return an error if
the buffer is already full.
Compile-tested only.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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