otherwise kernel can oops later in seq_release() due to dereferencing null file->private_data which is only set if seq_open() succeeds. BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 IP: seq_release+0xc/0x30 Call Trace: close_pdeo+0x37/0xd0 proc_reg_release+0x5d/0x60 __fput+0x9d/0x1d0 ____fput+0x9/0x10 task_work_run+0x75/0x90 do_exit+0x252/0xa00 do_group_exit+0x36/0xb0 SyS_exit_group+0xf/0x10
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| @@ -4228,7 +4228,7 @@ static int modules_open(struct inode *inode, struct file *file) · 4227 unmodified lines | ||
| 4228 | 4228 | m->private = kallsyms_show_value() ? NULL : (void *)8ul; |
| 4229 | 4229 | } |
| 4230 | 4230 | |
| 4231 | − return 0; | |
| 4231 | + return err; | |
| 4232 | 4232 | } |
| 4233 | 4233 | |
| 4234 | 4234 | static const struct file_operations proc_modules_operations = { |