Mark Langsdorf
2007-Dec-13 00:18 UTC
[Xen-devel] [PATCH][cpufreq] add bounds checking to cpufreq_stats.c from upstream
The cpufreq_stats.c will attempt to use an error return value as an index to an array, causing the kernel to oops. Stop that by doing bounds checking. This is a backport of upstream code. Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com> -Mark Langsdorf Operating System Research Center AMD diff -r cd744c5ec950 drivers/cpufreq/cpufreq_stats.c --- a/drivers/cpufreq/cpufreq_stats.c Wed Dec 12 10:18:35 2007 +0000 +++ b/drivers/cpufreq/cpufreq_stats.c Wed Dec 12 18:02:54 2007 -0600 @@ -292,6 +292,9 @@ cpufreq_stat_notifier_trans (struct noti if (old_index == new_index) return 0; + if ((old_index < 0) || (new_index < 0)) + return 0; + spin_lock(&cpufreq_stats_lock); stat->last_index = new_index; #ifdef CONFIG_CPU_FREQ_STAT_DETAILS _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel