| From | Christoph Hellwig <> | Subject | [PATCH 05/14] fs: check FMODE_WRITE in __kernel_write | Date | Thu, 28 May 2020 07:40:34 +0200 |
| |
We still need to check if the fѕ is open write, even for the low-level helper.
Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/read_write.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/read_write.c b/fs/read_write.c index 2c601d853ff3d..76be155ad9824 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -505,6 +505,8 @@ ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t const char __user *p; ssize_t ret; + if (!(file->f_mode & FMODE_WRITE)) + return -EBADF; if (!(file->f_mode & FMODE_CAN_WRITE)) return -EINVAL; -- 2.26.2
|