From: Mark Rustad Date: Mon, 14 Mar 2016 18:05:51 +0000 (-0700) Subject: ixgbe: Correct length check for round up X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=73457165d71d5ce0e41c0adb7bfa484702c36248;p=linux-beck.git ixgbe: Correct length check for round up The function ixgbe_host_interface_command actually uses a multiple of word sized buffer to do its business, but only checks against the actual length passed in. This means that on read operations it could be possible to modify locations beyond the length passed in. Change the check to round up in the same way, just to avoid any possible hazard. Signed-off-by: Mark Rustad Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c index dfdb1149b6fd..a2ca9ef0daab 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c @@ -3557,7 +3557,7 @@ s32 ixgbe_host_interface_command(struct ixgbe_hw *hw, u32 *buffer, if (buf_len == 0) return 0; - if (length < (buf_len + hdr_size)) { + if (length < round_up(buf_len, 4) + hdr_size) { hw_dbg(hw, "Buffer not large enough for reply message.\n"); return IXGBE_ERR_HOST_INTERFACE_COMMAND; }