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authorBen Hutchings <bhutchings@solarflare.com>2011-09-06 13:52:47 +0000
committerDavid S. Miller <davem@davemloft.net>2011-09-16 19:25:10 -0400
commit473e64ee4603671efa1e0785418e56e9ffdfc47b (patch)
treeff40ee34b7ac14c920993bb655527338419dea63 /include/linux/ethtool.h
parent815c7db5c809ea3d5735de3131ecdf758b0e14ff (diff)
ethtool: Update ethtool_rxnfc::rule_cnt on return from ETHTOOL_GRXCLSRLALL
A user-space process must use ETHTOOL_GRXCLSRLCNT to find the number of classification rules, then allocate a buffer of the right size, then use ETHTOOL_GRXCLSRLALL to fill the buffer. If some other process inserts or deletes a rule between those two operations, the user buffer might turn out to be the wrong size. If it's too small, the return value will be -EMSGSIZE. But if it's too large, there is no indication of this. Fix this by updating the rule_cnt field on return. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ethtool.h')
-rw-r--r--include/linux/ethtool.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 5d4a06accd82..45f00b61c096 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -496,9 +496,9 @@ struct ethtool_rx_flow_spec {
*
* For %ETHTOOL_GRXCLSRLALL, @rule_cnt specifies the array size of the
* user buffer for @rule_locs on entry. On return, @data is the size
- * of the rule table and @rule_locs contains the locations of the
- * defined rules. Drivers must use the second parameter to get_rxnfc()
- * instead of @rule_locs.
+ * of the rule table, @rule_cnt is the number of defined rules, and
+ * @rule_locs contains the locations of the defined rules. Drivers
+ * must use the second parameter to get_rxnfc() instead of @rule_locs.
*
* For %ETHTOOL_SRXCLSRLINS, @fs specifies the rule to add or update.
* @fs.@location specifies the location to use and must not be ignored.