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backing-file: use credential guards for splice write

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

Link: https://patch.msgid.link/20251103-work-creds-guards-simple-v1-6-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 12:26:54 +01:00
parent c3076d146e
commit b688171f91
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 5 additions and 6 deletions
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11
fs/backing-file.c
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@ -303,7 +303,6 @@ ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,
size_t len, unsigned int flags,
struct backing_file_ctx *ctx)
{
const struct cred *old_cred;
ssize_t ret;
if (WARN_ON_ONCE(!(out->f_mode & FMODE_BACKING)))
@ -316,11 +315,11 @@ ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,
if (ret)
return ret;
old_cred = override_creds(ctx->cred);
file_start_write(out);
ret = out->f_op->splice_write(pipe, out, &iocb->ki_pos, len, flags);
file_end_write(out);
revert_creds(old_cred);
scoped_with_creds(ctx->cred) {
file_start_write(out);
ret = out->f_op->splice_write(pipe, out, &iocb->ki_pos, len, flags);
file_end_write(out);
}
if (ctx->end_write)
ctx->end_write(iocb, ret);