3.16.63-rc1 review patch. If anyone has any objections, please let me know.
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From: Luca Coelho luciano.coelho@intel.com
commit 3d71c3f1f50cf309bd20659422af549bc784bfff upstream.
The rs_rate_from_ucode_rate() function may return -EINVAL if the rate is invalid, but none of the callsites check for the error, potentially making us access arrays with index IWL_RATE_INVALID, which is larger than the arrays, causing an out-of-bounds access. This will trigger KASAN warnings, such as the one reported in the bugzilla issue mentioned below.
This fixes https://bugzilla.kernel.org/show_bug.cgi?id=200659
Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Kalle Valo kvalo@codeaurora.org [bwh: Backported to 3.16: - Fix up one additional caller - Adjust filename, context Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -1057,7 +1057,10 @@ static void rs_tx_status(void *mvm_r, st */ table = &lq_sta->lq; ucode_rate = le32_to_cpu(table->rs_table[0]); - rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); + if (rs_rate_from_ucode_rate(ucode_rate, info->band, &rate)) { + WARN_ON_ONCE(1); + return; + } if (info->band == IEEE80211_BAND_5GHZ) rate.index -= IWL_FIRST_OFDM_RATE; mac_flags = info->status.rates[0].flags; @@ -1161,7 +1164,10 @@ static void rs_tx_status(void *mvm_r, st */ if (info->flags & IEEE80211_TX_STAT_AMPDU) { ucode_rate = le32_to_cpu(table->rs_table[0]); - rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); + if (rs_rate_from_ucode_rate(ucode_rate, info->band, &rate)) { + WARN_ON_ONCE(1); + return; + } rs_collect_tx_data(lq_sta, curr_tbl, rate.index, info->status.ampdu_len, info->status.ampdu_ack_len, @@ -1186,7 +1192,12 @@ static void rs_tx_status(void *mvm_r, st /* Collect data for each rate used during failed TX attempts */ for (i = 0; i <= retries; ++i) { ucode_rate = le32_to_cpu(table->rs_table[i]); - rs_rate_from_ucode_rate(ucode_rate, info->band, &rate); + if (rs_rate_from_ucode_rate(ucode_rate, info->band, + &rate)) { + WARN_ON_ONCE(1); + return; + } + /* * Only collect stats if retried rate is in the same RS * table as active/search. @@ -2677,7 +2688,10 @@ static void rs_build_rates_table_from_fi for (i = 0; i < num_rates; i++) lq_cmd->rs_table[i] = ucode_rate_le32;
- rs_rate_from_ucode_rate(ucode_rate, band, &rate); + if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { + WARN_ON_ONCE(1); + return; + }
if (is_mimo(&rate)) lq_cmd->mimo_delim = num_rates - 1; @@ -2928,8 +2942,11 @@ static void rs_program_fix_rate(struct i
if (lq_sta->dbg_fixed_rate) { struct rs_rate rate; - rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate, - lq_sta->band, &rate); + if (rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate, + lq_sta->band, &rate)) { + WARN_ON_ONCE(1); + return; + } rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate); iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false); }