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authorChristian Marangi <ansuelsmth@gmail.com>2023-10-24 20:30:14 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-10-24 22:02:06 +0200
commitea167a7fc2426f7685c3735e104921c1a20a6d3f (patch)
tree92612ed5f2153f1d3774d42b4121597af75747c8 /drivers/cpufreq
parente7a1b32e43b194bbf930281ae7f5149c420cd122 (diff)
cpufreq: stats: Fix buffer overflow detection in trans_stats()
Commit 3c0897c180c6 ("cpufreq: Use scnprintf() for avoiding potential buffer overflow") switched from snprintf to the more secure scnprintf but never updated the exit condition for PAGE_SIZE. As the commit say and as scnprintf document, what scnprintf returns what is actually written not counting the '\0' end char. This results in the case of len exceeding the size, len set to PAGE_SIZE - 1, as it can be written at max PAGE_SIZE - 1 (as '\0' is not counted) Because of len is never set to PAGE_SIZE, the function never break early, never prints the warning and never return -EFBIG. Fix this by changing the condition to PAGE_SIZE - 1 to correctly trigger the error. Cc: 5.10+ <stable@vger.kernel.org> # 5.10+ Fixes: 3c0897c180c6 ("cpufreq: Use scnprintf() for avoiding potential buffer overflow") Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq_stats.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index a33df3c66c88..40a9ff18da06 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -131,23 +131,23 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
len += sysfs_emit_at(buf, len, " From : To\n");
len += sysfs_emit_at(buf, len, " : ");
for (i = 0; i < stats->state_num; i++) {
- if (len >= PAGE_SIZE)
+ if (len >= PAGE_SIZE - 1)
break;
len += sysfs_emit_at(buf, len, "%9u ", stats->freq_table[i]);
}
- if (len >= PAGE_SIZE)
- return PAGE_SIZE;
+ if (len >= PAGE_SIZE - 1)
+ return PAGE_SIZE - 1;
len += sysfs_emit_at(buf, len, "\n");
for (i = 0; i < stats->state_num; i++) {
- if (len >= PAGE_SIZE)
+ if (len >= PAGE_SIZE - 1)
break;
len += sysfs_emit_at(buf, len, "%9u: ", stats->freq_table[i]);
for (j = 0; j < stats->state_num; j++) {
- if (len >= PAGE_SIZE)
+ if (len >= PAGE_SIZE - 1)
break;
if (pending)
@@ -157,12 +157,12 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
len += sysfs_emit_at(buf, len, "%9u ", count);
}
- if (len >= PAGE_SIZE)
+ if (len >= PAGE_SIZE - 1)
break;
len += sysfs_emit_at(buf, len, "\n");
}
- if (len >= PAGE_SIZE) {
+ if (len >= PAGE_SIZE - 1) {
pr_warn_once("cpufreq transition table exceeds PAGE_SIZE. Disabling\n");
return -EFBIG;
}