diff options
author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
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committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2019-03-28 11:16:26 +0100 |
commit | 6f01eb5bf8e8110ab5f3a8e7b0f3abf19a205e4b (patch) | |
tree | 4b3147335ed97e4b487fd84bcb7a959a38d9656e /net/can/gw.c | |
parent | 8f234193b8cc35c44614e4a4b05f2d920ff562e4 (diff) | |
parent | 6b50202a4d53bf527c640467bcff68b50a5e38a2 (diff) |
Merge tag 'v4.4.177' into toradex_vf_4.4-nextColibri-VF_LXDE-Image_2.8b6.183-20190331
This is the 4.4.177 stable release
Diffstat (limited to 'net/can/gw.c')
-rw-r--r-- | net/can/gw.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/net/can/gw.c b/net/can/gw.c index 77c8af4047ef..81650affa3fa 100644 --- a/net/can/gw.c +++ b/net/can/gw.c @@ -418,13 +418,29 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data) while (modidx < MAX_MODFUNCTIONS && gwj->mod.modfunc[modidx]) (*gwj->mod.modfunc[modidx++])(cf, &gwj->mod); - /* check for checksum updates when the CAN frame has been modified */ + /* Has the CAN frame been modified? */ if (modidx) { - if (gwj->mod.csumfunc.crc8) + /* get available space for the processed CAN frame type */ + int max_len = nskb->len - offsetof(struct can_frame, data); + + /* dlc may have changed, make sure it fits to the CAN frame */ + if (cf->can_dlc > max_len) + goto out_delete; + + /* check for checksum updates in classic CAN length only */ + if (gwj->mod.csumfunc.crc8) { + if (cf->can_dlc > 8) + goto out_delete; + (*gwj->mod.csumfunc.crc8)(cf, &gwj->mod.csum.crc8); + } + + if (gwj->mod.csumfunc.xor) { + if (cf->can_dlc > 8) + goto out_delete; - if (gwj->mod.csumfunc.xor) (*gwj->mod.csumfunc.xor)(cf, &gwj->mod.csum.xor); + } } /* clear the skb timestamp if not configured the other way */ @@ -436,6 +452,14 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data) gwj->dropped_frames++; else gwj->handled_frames++; + + return; + + out_delete: + /* delete frame due to misconfiguration */ + gwj->deleted_frames++; + kfree_skb(nskb); + return; } static inline int cgw_register_filter(struct cgw_job *gwj) |