diff options
author | Dave Airlie <airlied@gmail.com> | 2015-10-14 08:51:17 (GMT) |
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committer | Dave Airlie <airlied@redhat.com> | 2015-10-14 23:06:20 (GMT) |
commit | ae491542cbbbcca0ec8938c37d4079a985e58440 (patch) | |
tree | e0e7c931aee2edae9b3ce5a9689106557204de8c /drivers/gpu | |
parent | bc8c131ccdd62d4ed4f33c6b50f92907e7c32dee (diff) | |
download | linux-ae491542cbbbcca0ec8938c37d4079a985e58440.tar.xz |
drm/dp/mst: make mst i2c transfer code more robust.
This zeroes the msg so no random stack data ends up getting
sent, it also limits the function to not accepting > 4
i2c msgs.
Cc: stable@vger.kernel.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index bf27a07..5bca390 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2801,12 +2801,13 @@ static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs if (msgs[num - 1].flags & I2C_M_RD) reading = true; - if (!reading) { + if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); ret = -EIO; goto out; } + memset(&msg, 0, sizeof(msg)); msg.req_type = DP_REMOTE_I2C_READ; msg.u.i2c_read.num_transactions = num - 1; msg.u.i2c_read.port_number = port->port_num; |