From: fdmanana@kernel.org
To: linux-btrfs@vger.kernel.org
Subject: [PATCH] Btrfs: do not overwrite error return value in scrub progress ioctl
Date: Fri, 14 Dec 2018 19:45:13 +0000 [thread overview]
Message-ID: <20181214194513.21741-1-fdmanana@kernel.org> (raw)
From: Filipe Manana <fdmanana@suse.com>
If the call to btrfs_scrub_progress() failed we would overwrite the error
returned to user space with -EFAULT if the call to copy_to_user() failed
as well. Fix that by calling copy_to_user() only if btrfs_scrub_progress()
returned success.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
fs/btrfs/ioctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 01d18e1a393e..76848214a39f 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4331,7 +4331,7 @@ static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
- if (copy_to_user(arg, sa, sizeof(*sa)))
+ if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
ret = -EFAULT;
kfree(sa);
--
2.11.0
next reply other threads:[~2018-12-14 19:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-14 19:45 fdmanana [this message]
2018-12-17 7:33 ` [PATCH] Btrfs: do not overwrite error return value in scrub progress ioctl Nikolay Borisov
2019-01-02 17:43 ` David Sterba
2018-12-17 9:02 ` Anand Jain
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181214194513.21741-1-fdmanana@kernel.org \
--to=fdmanana@kernel.org \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox