diff options
| author | Kees Cook <kees@kernel.org> | 2025-05-09 11:46:45 -0700 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-05-15 13:20:33 +0200 |
| commit | 82bbe02b2500ef0a62053fe2eb84773fe31c5a0a (patch) | |
| tree | 5cdd43e91885a7e2adfc5dea7250530fc095d60d | |
| parent | 2c89c1b655c0b06823f4ee8b055140d8628fc4da (diff) | |
wifi: mac80211: Set n_channels after allocating struct cfg80211_scan_request
Make sure that n_channels is set after allocating the
struct cfg80211_registered_device::int_scan_req member. Seen with
syzkaller:
UBSAN: array-index-out-of-bounds in net/mac80211/scan.c:1208:5
index 0 is out of range for type 'struct ieee80211_channel *[] __counted_by(n_channels)' (aka 'struct ieee80211_channel *[]')
This was missed in the initial conversions because I failed to locate
the allocation likely due to the "sizeof(void *)" not matching the
"channels" array type.
Reported-by: syzbot+4bcdddd48bb6f0be0da1@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/lkml/680fd171.050a0220.2b69d1.045e.GAE@google.com/
Fixes: e3eac9f32ec0 ("wifi: cfg80211: Annotate struct cfg80211_scan_request with __counted_by")
Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://patch.msgid.link/20250509184641.work.542-kees@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/main.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 741e6c7edcb7c..6b6de43d9420a 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -1354,10 +1354,12 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); - local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + - sizeof(void *) * channels, GFP_KERNEL); + local->int_scan_req = kzalloc(struct_size(local->int_scan_req, + channels, channels), + GFP_KERNEL); if (!local->int_scan_req) return -ENOMEM; + local->int_scan_req->n_channels = channels; eth_broadcast_addr(local->int_scan_req->bssid); |