From: Jiufei Xue <[email protected]>
To: [email protected], [email protected]
Subject: [PATCH] io_uring: set table->files[i] to NULL when io_sqe_file_register failed
Date: Wed, 2 Sep 2020 17:59:39 +0800 [thread overview]
Message-ID: <[email protected]> (raw)
While io_sqe_file_register() failed in __io_sqe_files_update(),
table->files[i] still point to the original file which may freed
soon, and that will trigger use-after-free problems.
Signed-off-by: Jiufei Xue <[email protected]>
---
fs/io_uring.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index ce69bd9..0092418 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7353,6 +7353,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
table->files[index] = file;
err = io_sqe_file_register(ctx, file, i);
if (err) {
+ table->files[index] = NULL;
fput(file);
break;
}
--
1.8.3.1
next reply other threads:[~2020-09-02 9:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 9:59 Jiufei Xue [this message]
2020-09-02 14:12 ` [PATCH] io_uring: set table->files[i] to NULL when io_sqe_file_register failed Jens Axboe
2020-09-02 15:07 ` missing backport markings on security fix [was: [PATCH] io_uring: set table->files[i] to NULL when io_sqe_file_register failed] Jann Horn
2020-09-02 15:11 ` Jens Axboe
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=1599040779-41219-1-git-send-email-jiufei.xue@linux.alibaba.com \
[email protected] \
[email protected] \
[email protected] \
/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