diff options
| author | Kees Cook <keescook@chromium.org> | 2024-04-24 15:01:01 -0700 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-05-03 09:20:26 +0200 |
| commit | 838c7b8f1f278404d9d684c34a8cb26dc41aaaa1 (patch) | |
| tree | dda74becf98e11f5e06e983067f2ebca3c0dc75a /net/wireless/nl80211.c | |
| parent | 3d913719df14c28c4d3819e7e6d150760222bda4 (diff) | |
wifi: nl80211: Avoid address calculations via out of bounds array indexing
Before request->channels[] can be used, request->n_channels must be set.
Additionally, address calculations for memory after the "channels" array
need to be calculated from the allocation base ("request") rather than
via the first "out of bounds" index of "channels", otherwise run-time
bounds checking will throw a warning.
Reported-by: Nathan Chancellor <nathan@kernel.org>
Fixes: e3eac9f32ec0 ("wifi: cfg80211: Annotate struct cfg80211_scan_request with __counted_by")
Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://msgid.link/20240424220057.work.819-kees@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/nl80211.c')
| -rw-r--r-- | net/wireless/nl80211.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 30ff9a470813..65c416e8d25e 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -9162,6 +9162,7 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info) struct wiphy *wiphy; int err, tmp, n_ssids = 0, n_channels, i; size_t ie_len, size; + size_t ssids_offset, ie_offset; wiphy = &rdev->wiphy; @@ -9207,21 +9208,20 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info) return -EINVAL; size = struct_size(request, channels, n_channels); + ssids_offset = size; size = size_add(size, array_size(sizeof(*request->ssids), n_ssids)); + ie_offset = size; size = size_add(size, ie_len); request = kzalloc(size, GFP_KERNEL); if (!request) return -ENOMEM; + request->n_channels = n_channels; if (n_ssids) - request->ssids = (void *)&request->channels[n_channels]; + request->ssids = (void *)request + ssids_offset; request->n_ssids = n_ssids; - if (ie_len) { - if (n_ssids) - request->ie = (void *)(request->ssids + n_ssids); - else - request->ie = (void *)(request->channels + n_channels); - } + if (ie_len) + request->ie = (void *)request + ie_offset; i = 0; if (scan_freqs) { |