Replace the calculations for the payload length in qtnf_cmd_band_fill_iftype with struct_size() and size_sub(). While the payload length does not get directly passed to an allocation function, the performed calculation is still calculating the size of a flexible array structure (minus the size of a header structure). Signed-off-by: Jacob Keller <jacob.e.keller@xxxxxxxxx> Cc: Igor Mitsyanko <imitsyanko@xxxxxxxxxxxxx> Cc: Sergey Matyukevich <geomatsi@xxxxxxxxx> --- This was discovered by a coccinelle patch I developed, and submitted at: https://lore.kernel.org/all/20230227202428.3657443-1-jacob.e.keller@xxxxxxxxx/ V1: https://lore.kernel.org/linux-wireless/99a9d4a2-d032-1c9d-90c6-3a68f6b3a092@xxxxxxxxx/ Changes since v1 * Split series into individual postings to avoid confusion about dependency * Fixed subject line drivers/net/wireless/quantenna/qtnfmac/commands.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/quantenna/qtnfmac/commands.c b/drivers/net/wireless/quantenna/qtnfmac/commands.c index b1b73478d89b..68ae9c7ea95a 100644 --- a/drivers/net/wireless/quantenna/qtnfmac/commands.c +++ b/drivers/net/wireless/quantenna/qtnfmac/commands.c @@ -1325,9 +1325,10 @@ static int qtnf_cmd_band_fill_iftype(const u8 *data, struct ieee80211_sband_iftype_data *iftype_data; const struct qlink_tlv_iftype_data *tlv = (const struct qlink_tlv_iftype_data *)data; - size_t payload_len = tlv->n_iftype_data * sizeof(*tlv->iftype_data) + - sizeof(*tlv) - - sizeof(struct qlink_tlv_hdr); + size_t payload_len; + + payload_len = struct_size(tlv, iftype_data, tlv->n_iftype_data); + payload_len = size_sub(payload_len, sizeof(struct qlink_tlv_hdr)); if (tlv->hdr.len != cpu_to_le16(payload_len)) { pr_err("bad IFTYPE_DATA TLV len %u\n", tlv->hdr.len); base-commit: 8f9850dd8d23c1290cb642ce9548a440da5771ec -- 2.39.1.405.gd4c25cc71f83
