[SRU][J/F][PATCH 0/1] CVE-2024-41071

[Koichiro Den]

[Impact]

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 ieee80211_channel *[]'
[...]
[   83.964264] Call Trace:
[   83.964267]  <TASK>
[   83.964269]  dump_stack_lvl+0x3f/0xc0
[   83.964274]  __ubsan_handle_out_of_bounds+0xec/0x110
[   83.964278]  ieee80211_prep_hw_scan+0x2db/0x4b0
[   83.964281]  __ieee80211_start_scan+0x601/0x990
[   83.964291]  nl80211_trigger_scan+0x874/0x980
[   83.964295]  genl_family_rcv_msg_doit+0xe8/0x160
[   83.964298]  genl_rcv_msg+0x240/0x270
[...]

[1] https://bugzilla.kernel.org/show_bug.cgi?id=218810

[Backport]

Adjusted context due to missing commit 5add321c329b
("wifi: cfg80211: remove scan_width support")

[Fix]

Noble:  fixed via stable
Jammy:  Backport - adjusted contexts due to missing commits, see [Backport]
Focal:  Backport - adjusted contexts due to missing commits, see [Backport]
Bionic: fix sent to esm ML
Xenial: fix sent to esm ML
Trusty: not affected

[Test case]

Compile and boot tested

[Where problem could occur]

This fix impacts those who uses SoftMAC WiFi devices, an issue with this
fix would be visible to the user via UBSAN splat.


Kenton Groombridge (1):
  wifi: mac80211: Avoid address calculations via out of bounds array
    indexing

 net/mac80211/scan.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

-- 
2.43.0