Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 02/11] fs: check FMODE_WRITE in __kernel_write | Date | Fri, 8 May 2020 11:22:13 +0200 |
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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 d5aaf3a4198b9..d5c754080e5a5 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
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