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wifi: cfg80211: Annotate struct cfg80211_mbssid_elems with __counted_by

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Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct cfg80211_mbssid_elems.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20230817211531.4193219-3-keescook@chromium.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Kees Cook 2023-08-17 14:15:25 -07:00 committed by Johannes Berg
parent d4d3aaf25a
commit c14679d700
2 changed files with 2 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/net/cfg80211.h
View file

@ -1187,7 +1187,7 @@ struct cfg80211_mbssid_elems {
struct {
const u8 *data;
size_t len;
} elem[];
} elem[] __counted_by(cnt);
};
/**

2
net/wireless/nl80211.c
View file

@ -5438,13 +5438,13 @@ nl80211_parse_mbssid_elems(struct wiphy *wiphy, struct nlattr *attrs)
elems = kzalloc(struct_size(elems, elem, num_elems), GFP_KERNEL);
if (!elems)
return ERR_PTR(-ENOMEM);
elems->cnt = num_elems;
nla_for_each_nested(nl_elems, attrs, rem_elems) {
elems->elem[i].data = nla_data(nl_elems);
elems->elem[i].len = nla_len(nl_elems);
i++;
}
elems->cnt = num_elems;
return elems;
}