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erofs: use credential guards 

Use credential guards for scoped credential override with automatic
restoration on scope exit.

Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-9-a3e156839e7f@kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-11-03 12:26:57 +01:00
parent ff2044cd27
commit 5e88d1aadc
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 2 additions and 4 deletions
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4
fs/erofs/fileio.c
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@ -47,7 +47,6 @@ static void erofs_fileio_ki_complete(struct kiocb *iocb, long ret)
static void erofs_fileio_rq_submit(struct erofs_fileio_rq *rq)
{
const struct cred *old_cred;
struct iov_iter iter;
int ret;
@ -61,9 +60,8 @@ static void erofs_fileio_rq_submit(struct erofs_fileio_rq *rq)
rq->iocb.ki_flags = IOCB_DIRECT;
iov_iter_bvec(&iter, ITER_DEST, rq->bvecs, rq->bio.bi_vcnt,
rq->bio.bi_iter.bi_size);
old_cred = override_creds(rq->iocb.ki_filp->f_cred);
scoped_with_creds(rq->iocb.ki_filp->f_cred)
ret = vfs_iocb_iter_read(rq->iocb.ki_filp, &rq->iocb, &iter);
revert_creds(old_cred);
if (ret != -EIOCBQUEUED)
erofs_fileio_ki_complete(&rq->iocb, ret);
}