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wifi: mac80211: Set n_channels after allocating struct cfg80211_scan_request

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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: [email protected]
Closes: https://lore.kernel.org/lkml/[email protected]/
Fixes: e3eac9f32e ("wifi: cfg80211: Annotate struct cfg80211_scan_request with __counted_by")
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Kees Cook authored and Johannes Berg committed 2025-05-15 13:20:33 +02:00
1 parent 2c89c1b655
commit 82bbe02b25
1 file changed
+4 -2
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net/mac80211/main.c
+4 -2
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@@ -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);