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mac80211: mesh: handle failed alloc for rmc cache

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In the unlikely case that mesh_rmc_init() fails with -ENOMEM,
the rmc pointer will be left as NULL but the interface is still
operational because ieee80211_mesh_init_sdata() is not allowed
to fail.

If this happens, we would blindly dereference rmc when checking
whether a multicast frame is in the cache.  Instead just drop the
frames in the forwarding path.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Bob Copeland 2016-03-18 22:11:28 -04:00 committed by Johannes Berg
parent 749329594b
commit 0aa7fabbd5
1 changed files with 3 additions and 0 deletions
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3
net/mac80211/mesh.c
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@ -220,6 +220,9 @@ int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
u8 idx;
struct rmc_entry *p, *n;
if (!rmc)
return -1;
/* Don't care about endianness since only match matters */
memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;