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-rw-r--r--kernel/printk.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index ceb4a2f775a1..572730bd8a5c 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -414,7 +414,9 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf,
if (!user)
return -EBADF;
- mutex_lock(&user->lock);
+ ret = mutex_lock_interruptible(&user->lock);
+ if (ret)
+ return ret;
raw_spin_lock(&logbuf_lock);
while (user->seq == log_next_seq) {
if (file->f_flags & O_NONBLOCK) {
@@ -976,6 +978,7 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
{
bool clear = false;
static int saved_console_loglevel = -1;
+ static DEFINE_MUTEX(syslog_mutex);
int error;
error = check_syslog_permissions(type, from_file);
@@ -1002,11 +1005,17 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
error = -EFAULT;
goto out;
}
+ error = mutex_lock_interruptible(&syslog_mutex);
+ if (error)
+ goto out;
error = wait_event_interruptible(log_wait,
syslog_seq != log_next_seq);
- if (error)
+ if (error) {
+ mutex_unlock(&syslog_mutex);
goto out;
+ }
error = syslog_print(buf, len);
+ mutex_unlock(&syslog_mutex);
break;
/* Read/clear last kernel messages */
case SYSLOG_ACTION_READ_CLEAR: