path: root/fs/locks.c
diff options
authorAlexey Gladkov <gladkov.alexey@gmail.com>2020-05-18 20:07:38 +0200
committerEric W. Biederman <ebiederm@xmission.com>2020-05-19 07:07:50 -0500
commit9d78edeaec759f997c303f286ecd39daee166f2a (patch)
tree2325279bb24196709e59a506cbf4f346c1e69a2b /fs/locks.c
parentposix-cpu-timers: Use pids not tasks in lookup (diff)
proc: proc_pid_ns takes super_block as an argument
syzbot found that touch /proc/testfile causes NULL pointer dereference at tomoyo_get_local_path() because inode of the dentry is NULL. Before c59f415a7cb6, Tomoyo received pid_ns from proc's s_fs_info directly. Since proc_pid_ns() can only work with inode, using it in the tomoyo_get_local_path() was wrong. To avoid creating more functions for getting proc_ns, change the argument type of the proc_pid_ns() function. Then, Tomoyo can use the existing super_block to get pid_ns. Link: https://lkml.kernel.org/r/0000000000002f0c7505a5b0e04c@google.com Link: https://lkml.kernel.org/r/20200518180738.2939611-1-gladkov.alexey@gmail.com Reported-by: syzbot+c1af344512918c61362c@syzkaller.appspotmail.com Fixes: c59f415a7cb6 ("Use proc_pid_ns() to get pid_namespace from the proc superblock") Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/locks.c')
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 399c5dbb72c4..ab702d6efb55 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2823,7 +2823,7 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
struct inode *inode = NULL;
unsigned int fl_pid;
- struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file));
+ struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file)->i_sb);
fl_pid = locks_translate_pid(fl, proc_pidns);
@@ -2901,7 +2901,7 @@ static int locks_show(struct seq_file *f, void *v)
struct locks_iterator *iter = f->private;
struct file_lock *fl, *bfl;
- struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file));
+ struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file)->i_sb);
fl = hlist_entry(v, struct file_lock, fl_link);