| Message ID | 20241029-nl80211_parse_sched_scan-bounds-checker-fix-v2-1-c804b787341f@google.com (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Johannes Berg |
| Headers | show |
| Series | [v2] wifi: nl80211: fix bounds checker error in nl80211_parse_sched_scan | expand |
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index d7d099f7118ab5d5c745905abdea85d246c2b7b2..9b1b9dc5a7eb2a864da7b0212bc6a156b7757a9d 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -9776,6 +9776,7 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev, request = kzalloc(size, GFP_KERNEL); if (!request) return ERR_PTR(-ENOMEM); + request->n_channels = n_channels; if (n_ssids) request->ssids = (void *)request +
The channels array in the cfg80211_scan_request has a __counted_by attribute attached to it, which points to the n_channels variable. This attribute is used in bounds checking, and if it is not set before the array is filled, then the bounds sanitizer will issue a warning or a kernel panic if CONFIG_UBSAN_TRAP is set. This patch sets the size of allocated memory as the initial value for n_channels. It is updated with the actual number of added elements after the array is filled. Fixes: aa4ec06c455d ("wifi: cfg80211: use __counted_by where appropriate") Cc: stable@vger.kernel.org Signed-off-by: Aleksei Vetrov <vvvvvv@google.com> --- Changes in v2: - Added Fixes tag and added stable to CC - Link to v1: https://lore.kernel.org/r/20241028-nl80211_parse_sched_scan-bounds-checker-fix-v1-1-bb640be0ebb7@google.com --- net/wireless/nl80211.c | 1 + 1 file changed, 1 insertion(+) --- base-commit: 81983758430957d9a5cb3333fe324fd70cf63e7e change-id: 20241028-nl80211_parse_sched_scan-bounds-checker-fix-c5842f41b863 Best regards,