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iwlwifi: mvm: rs: add size checks when printing to a buffer 

Replace sprintf by scnprintf throughout rs code.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Gregory Greenman 2017-11-26 15:51:31 +02:00 committed by Luca Coelho
parent 177a11cf1c
commit f6f046f0c0
3 changed files with 45 additions and 36 deletions
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6
drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
View File

@ -460,7 +460,8 @@ static ssize_t iwl_dbgfs_rs_data_read(struct file *file, char __user *user_buf,
"last tx rate=0x%X ",
lq_sta->last_rate_n_flags);
desc += rs_pretty_print_rate(buff + desc, lq_sta->last_rate_n_flags);
desc += rs_pretty_print_rate(buff + desc, bufsz - desc,
lq_sta->last_rate_n_flags);
mutex_unlock(&mvm->mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
@ -973,7 +974,8 @@ static ssize_t iwl_dbgfs_frame_stats_read(struct iwl_mvm *mvm,
continue;
pos += scnprintf(pos, endpos - pos, "Rate[%d]: ",
(int)(ARRAY_SIZE(stats->last_rates) - i));
pos += rs_pretty_print_rate(pos, stats->last_rates[idx]);
pos += rs_pretty_print_rate(pos, endpos - pos,
stats->last_rates[idx]);
}
spin_unlock_bh(&mvm->drv_stats_lock);

2
drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
View File

@ -1591,7 +1591,7 @@ iwl_mvm_vif_dbgfs_clean(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
/* rate scaling */
int iwl_mvm_send_lq_cmd(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq, bool init);
void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg);
int rs_pretty_print_rate(char *buf, const u32 rate);
int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate);
void rs_update_last_rssi(struct iwl_mvm *mvm,
struct iwl_mvm_sta *mvmsta,
struct ieee80211_rx_status *rx_status);

47
drivers/net/wireless/intel/iwlwifi/mvm/rs.c
View File

@ -3579,7 +3579,7 @@ static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
}
#ifdef CONFIG_MAC80211_DEBUGFS
int rs_pretty_print_rate(char *buf, const u32 rate)
int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
{
char *type, *bw;
@ -3590,7 +3590,7 @@ int rs_pretty_print_rate(char *buf, const u32 rate)
!(rate & RATE_MCS_VHT_MSK)) {
int index = iwl_hwrate_to_plcp_idx(rate);
return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
rs_pretty_ant(ant),
index == IWL_RATE_INVALID ? "BAD" :
iwl_rate_mcs[index].mbps);
@ -3627,7 +3627,8 @@ int rs_pretty_print_rate(char *buf, const u32 rate)
bw = "BAD BW";
}
return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
return scnprintf(buf, bufsz,
"%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
type, rs_pretty_ant(ant), bw, mcs, nss,
(rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
(rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
@ -3689,6 +3690,7 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
int desc = 0;
int i = 0;
ssize_t ret;
static const size_t bufsz = 2048;
struct iwl_lq_sta *lq_sta = file->private_data;
struct iwl_mvm_sta *mvmsta =
@ -3699,55 +3701,59 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
u32 ss_params;
mvm = lq_sta->pers.drv;
buff = kmalloc(2048, GFP_KERNEL);
buff = kmalloc(bufsz, GFP_KERNEL);
if (!buff)
return -ENOMEM;
desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
desc += scnprintf(buff + desc, bufsz - desc,
"sta_id %d\n", lq_sta->lq.sta_id);
desc += scnprintf(buff + desc, bufsz - desc,
"failed=%d success=%d rate=0%lX\n",
lq_sta->total_failed, lq_sta->total_success,
lq_sta->active_legacy_rate);
desc += sprintf(buff+desc, "fixed rate 0x%X\n",
desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
lq_sta->pers.dbg_fixed_rate);
desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
(iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
(iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
(iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
desc += sprintf(buff+desc, "lq type %s\n",
desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
(is_legacy(rate)) ? "legacy" :
is_vht(rate) ? "VHT" : "HT");
if (!is_legacy(rate)) {
desc += sprintf(buff + desc, " %s",
desc += scnprintf(buff + desc, bufsz - desc, " %s",
(is_siso(rate)) ? "SISO" : "MIMO2");
desc += sprintf(buff + desc, " %s",
desc += scnprintf(buff + desc, bufsz - desc, " %s",
(is_ht20(rate)) ? "20MHz" :
(is_ht40(rate)) ? "40MHz" :
(is_ht80(rate)) ? "80MHz" :
(is_ht160(rate)) ? "160MHz" : "BAD BW");
desc += sprintf(buff + desc, " %s %s %s %s\n",
desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
(rate->sgi) ? "SGI" : "NGI",
(rate->ldpc) ? "LDPC" : "BCC",
(lq_sta->is_agg) ? "AGG on" : "",
(mvmsta->tlc_amsdu) ? "AMSDU on" : "");
}
desc += sprintf(buff+desc, "last tx rate=0x%X\n",
desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
lq_sta->last_rate_n_flags);
desc += sprintf(buff+desc,
desc += scnprintf(buff + desc, bufsz - desc,
"general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
lq_sta->lq.flags,
lq_sta->lq.mimo_delim,
lq_sta->lq.single_stream_ant_msk,
lq_sta->lq.dual_stream_ant_msk);
desc += sprintf(buff+desc,
desc += scnprintf(buff + desc, bufsz - desc,
"agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
le16_to_cpu(lq_sta->lq.agg_time_limit),
lq_sta->lq.agg_disable_start_th,
lq_sta->lq.agg_frame_cnt_limit);
desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
lq_sta->lq.reduced_tpc);
ss_params = le32_to_cpu(lq_sta->lq.ss_params);
desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
desc += scnprintf(buff + desc, bufsz - desc,
"single stream params: %s%s%s%s\n",
(ss_params & LQ_SS_PARAMS_VALID) ?
"VALID" : "INVALID",
(ss_params & LQ_SS_BFER_ALLOWED) ?
@ -3756,7 +3762,7 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
", STBC" : "",
(ss_params & LQ_SS_FORCE) ?
", FORCE" : "");
desc += sprintf(buff+desc,
desc += scnprintf(buff + desc, bufsz - desc,
"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
lq_sta->lq.initial_rate_index[0],
lq_sta->lq.initial_rate_index[1],
@ -3766,8 +3772,9 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
desc += rs_pretty_print_rate(buff+desc, r);
desc += scnprintf(buff + desc, bufsz - desc,
" rate[%d] 0x%X ", i, r);
desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
}
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);