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nfp: bpf: prevent integer overflow in nfp_bpf_event_output()

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The "sizeof(struct cmsg_bpf_event) + pkt_size + data_size" math could
potentially have an integer wrapping bug on 32bit systems.  Check for
this and return an error.

Fixes: 9816dd35ec ("nfp: bpf: perf event output helpers support")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/6074805b-e78d-4b8a-bf05-e929b5377c28@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dan Carpenter
2025-01-13 09:18:39 +03:00
committed by Jakub Kicinski
parent f62bb88782
commit 16ebb6f5b6
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/netronome/nfp/bpf/offload.c
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@@ -458,7 +458,8 @@ int nfp_bpf_event_output(struct nfp_app_bpf *bpf, const void *data,
map_id_full = be64_to_cpu(cbe->map_ptr);
map_id = map_id_full;
if (len < sizeof(struct cmsg_bpf_event) + pkt_size + data_size)
if (size_add(pkt_size, data_size) > INT_MAX ||
len < sizeof(struct cmsg_bpf_event) + pkt_size + data_size)
return -EINVAL;
if (cbe->hdr.ver != NFP_CCM_ABI_VERSION)
return -EINVAL;