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io_uring: abort file assignment prior to assigning creds 

We need to either restore creds properly if we fail on the file
assignment, or just do the file assignment first instead. Let's do
the latter as it's simpler, should make no difference here for
file assignment.

Link: https://lore.kernel.org/lkml/000000000000a7edb305dca75a50@google.com/
Reported-by: syzbot+60c52ca98513a8760a91@syzkaller.appspotmail.com
Fixes: 6bf9c47a39 ("io_uring: defer file assignment")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-04-14 20:23:40 -06:00
parent 7179c3ce3d
commit 701521403c
1 changed files with 3 additions and 2 deletions
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5
fs/io_uring.c
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@ -7111,13 +7111,14 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
const struct cred *creds = NULL;
int ret;
if (unlikely(!io_assign_file(req, issue_flags)))
return -EBADF;
if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred()))
creds = override_creds(req->creds);
if (!io_op_defs[req->opcode].audit_skip)
audit_uring_entry(req->opcode);
if (unlikely(!io_assign_file(req, issue_flags)))
return -EBADF;
switch (req->opcode) {
case IORING_OP_NOP: