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| author | Andrew Rybchenko <Andrew.Rybchenko@oktetlabs.ru> | 2016-08-26 11:19:34 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-08-26 21:40:44 -0700 |
| commit | e70c70c38d7a5ced76fc8b1c4a7ccee76e9c2911 (patch) | |
| tree | f0409c417d22904e551a2240f711e6ffbb4848a8 /drivers/net/ethernet/sfc/ef10.c | |
| parent | 5c1f5b457b86a263d0e21c8f3ebe83d515e7bcce (diff) | |
| download | linux-e70c70c38d7a5ced76fc8b1c4a7ccee76e9c2911.tar.gz linux-e70c70c38d7a5ced76fc8b1c4a7ccee76e9c2911.tar.xz | |
sfc: fix potential stack corruption from running past stat bitmask
On 32-bit systems, mask is only an array of 3 longs, not 4, so don't try
to write to mask[3].
Also include build-time checks in case the size of the bitmask changes.
Fixes: 3c36a2aded8c ("sfc: display vadaptor statistics for all interfaces")
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/sfc/ef10.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/ef10.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index f658fee74f18..e00a669e9e09 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -1517,13 +1517,14 @@ static void efx_ef10_get_stat_mask(struct efx_nic *efx, unsigned long *mask) } #if BITS_PER_LONG == 64 + BUILD_BUG_ON(BITS_TO_LONGS(EF10_STAT_COUNT) != 2); mask[0] = raw_mask[0]; mask[1] = raw_mask[1]; #else + BUILD_BUG_ON(BITS_TO_LONGS(EF10_STAT_COUNT) != 3); mask[0] = raw_mask[0] & 0xffffffff; mask[1] = raw_mask[0] >> 32; mask[2] = raw_mask[1] & 0xffffffff; - mask[3] = raw_mask[1] >> 32; #endif } |