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ethtool: Fix potential user buffer overflow for ETHTOOL_{G, S}RXFH

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struct ethtool_rxnfc was originally defined in 2.6.27 for the
ETHTOOL_{G,S}RXFH command with only the cmd, flow_type and data
fields.  It was then extended in 2.6.30 to support various additional
commands.  These commands should have been defined to use a new
structure, but it is too late to change that now.

Since user-space may still be using the old structure definition
for the ETHTOOL_{G,S}RXFH commands, and since they do not need the
additional fields, only copy the originally defined fields to and
from user-space.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-06-28 08:45:58 +00:00 • committed by David S. Miller
parent db048b6903
commit bf988435bd
2 changed files with 29 additions and 9 deletions
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2
include/linux/ethtool.h
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@ -379,6 +379,8 @@ struct ethtool_rxnfc {
__u32 flow_type;
/* The rx flow hash value or the rule DB size */
__u64 data;
/* The following fields are not valid and must not be used for
* the ETHTOOL_{G,X}RXFH commands. */
struct ethtool_rx_flow_spec fs;
__u32 rule_cnt;
__u32 rule_locs[0];