In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: Avoid address calculations via out of bounds array indexing
req->n_channels must be set before req->channels[] can be used.
This patch fixes one of the issues encountered in [1].
[ 83.964255] UBSAN: array-index-out-of-bounds in net/mac80211/scan.c:364:4 [ 83.964258] index 0 is out of range for type 'struct ieee80211channel *[]' [...] [ 83.964264] Call Trace: [ 83.964267] <TASK> [ 83.964269] dumpstacklvl+0x3f/0xc0 [ 83.964274] _ubsanhandleoutofbounds+0xec/0x110 [ 83.964278] ieee80211prephwscan+0x2db/0x4b0 [ 83.964281] _ieee80211startscan+0x601/0x990 [ 83.964291] nl80211triggerscan+0x874/0x980 [ 83.964295] genlfamilyrcvmsgdoit+0xe8/0x160 [ 83.964298] genlrcvmsg+0x240/0x270 [...]
[1] https://bugzilla.kernel.org/show_bug.cgi?id=218810