5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Lizhi Xu lizhi.xu@windriver.com
commit 98feccbf32cfdde8c722bc4587aaa60ee5ac33f0 upstream.
If a large count is provided, it will trigger a warning in bitmap_parse_user. Also check zero for it.
Cc: stable@vger.kernel.org Fixes: 9e01c1b74c953 ("cpumask: convert kernel trace functions") Link: https://lore.kernel.org/20241216073238.2573704-1-lizhi.xu@windriver.com Reported-by: syzbot+0aecfd34fb878546f3fd@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=0aecfd34fb878546f3fd Tested-by: syzbot+0aecfd34fb878546f3fd@syzkaller.appspotmail.com Signed-off-by: Lizhi Xu lizhi.xu@windriver.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/trace.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5250,6 +5250,9 @@ tracing_cpumask_write(struct file *filp, cpumask_var_t tracing_cpumask_new; int err;
+ if (count == 0 || count > KMALLOC_MAX_SIZE) + return -EINVAL; + if (!zalloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) return -ENOMEM;