mac80211: minstrels: fix buffer overflow in HT debugfs rc_stats

ATM an HT rc_stats line is 106 chars.
Times 8(MCS_GROUP_RATES)*3(SS)*2(GI)*2(BW) + CCK(4), i.e. x100, this is
well above the current 8192 - sizeof(*ms) currently allocated.

Fix this by squeezing the output as follows (not that we're short on
memory but this also improves readability and range, the new format adds
one more digit to *ok/*cum and ok/cum):

- Before (HT) (106 ch):
type           rate     throughput  ewma prob   this prob  retry   this succ/attempt   success    attempts
CCK/LP          5.5M           0.0        0.0         0.0      0              0(  0)         0           0
HT20/LGI ABCDP MCS0            0.0        0.0         0.0      1              0(  0)         0           0
- After (75 ch):
type           rate     tpt eprob *prob ret  *ok(*cum)        ok(      cum)
CCK/LP          5.5M    0.0   0.0   0.0   0    0(   0)         0(        0)
HT20/LGI ABCDP MCS0     0.0   0.0   0.0   1    0(   0)         0(        0)

- Align non-HT format Before (non-HT) (83 ch):
rate      throughput  ewma prob  this prob  this succ/attempt   success    attempts
ABCDP  6         0.0        0.0        0.0             0(  0)         0           0
      54         0.0        0.0        0.0             0(  0)         0           0
- After (61 ch):
rate          tpt eprob *prob  *ok(*cum)        ok(      cum)
ABCDP  1      0.0   0.0   0.0    0(   0)         0(        0)
      54      0.0   0.0   0.0    0(   0)         0(        0)

*This also adds dynamic checks for overflow, lowers the size of the
non-HT request (allowing > 30 entries) and replaces the buddy-rounded
allocations (s/sizeof(*ms) + 8192/8192).
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rc80211_minstrel_debugfs.c

@@ -62,14 +62,14 @@ minstrel_stats_open(struct inode *inode, struct file *file)
 	unsigned int i, tp, prob, eprob;
 	char *p;
 
-	ms = kmalloc(sizeof(*ms) + 4096, GFP_KERNEL);
+	ms = kmalloc(2048, GFP_KERNEL);
 	if (!ms)
 		return -ENOMEM;
 
 	file->private_data = ms;
 	p = ms->buf;
-	p += sprintf(p, "rate      throughput  ewma prob  this prob  "
-			"this succ/attempt   success    attempts\n");
+	p += sprintf(p, "rate          tpt eprob *prob"
+			"  *ok(*cum)        ok(      cum)\n");
 	for (i = 0; i < mi->n_rates; i++) {
 		struct minstrel_rate *mr = &mi->r[i];
 		struct minstrel_rate_stats *mrs = &mi->r[i].stats;
@@ -86,8 +86,8 @@ minstrel_stats_open(struct inode *inode, struct file *file)
 		prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
 		eprob = MINSTREL_TRUNC(mrs->probability * 1000);
 
-		p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
-				"   %3u(%3u)  %8llu    %8llu\n",
+		p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u"
+				" %4u(%4u) %9llu(%9llu)\n",
 				tp / 10, tp % 10,
 				eprob / 10, eprob % 10,
 				prob / 10, prob % 10,
@@ -102,6 +102,8 @@ minstrel_stats_open(struct inode *inode, struct file *file)
 			mi->sample_packets);
 	ms->len = p - ms->buf;
 
+	WARN_ON(ms->len + sizeof(*ms) > 2048);
+
 	return 0;
 }
 

net/mac80211/rc80211_minstrel_ht_debugfs.c

@@ -63,8 +63,8 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
 		prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
 		eprob = MINSTREL_TRUNC(mr->probability * 1000);
 
-		p += sprintf(p, "      %6u.%1u   %6u.%1u    %6u.%1u    "
-				"%3u            %3u(%3u)  %8llu    %8llu\n",
+		p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u "
+				"%3u %4u(%4u) %9llu(%9llu)\n",
 				tp / 10, tp % 10,
 				eprob / 10, eprob % 10,
 				prob / 10, prob % 10,
@@ -96,14 +96,15 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
 		return ret;
 	}
 
-	ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
+	ms = kmalloc(8192, GFP_KERNEL);
 	if (!ms)
 		return -ENOMEM;
 
 	file->private_data = ms;
 	p = ms->buf;
-	p += sprintf(p, "type           rate     throughput  ewma prob   "
-		     "this prob  retry   this succ/attempt   success    attempts\n");
+	p += sprintf(p, "type           rate     tpt eprob *prob "
+			"ret  *ok(*cum)        ok(      cum)\n");
+
 
 	p = minstrel_ht_stats_dump(mi, max_mcs, p);
 	for (i = 0; i < max_mcs; i++)
@@ -118,6 +119,8 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
 		MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 	ms->len = p - ms->buf;
 
+	WARN_ON(ms->len + sizeof(*ms) > 8192);
+
 	return nonseekable_open(inode, file);
 }