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ksmbd: allow FSCTL_SET_SPARSE without input buffer

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FSCTL_SET_SPARSE without an input buffer sets a file sparse.  Treat a
zero-length input buffer as SetSparse=true and keep rejecting truncated
non-empty buffers.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-07-08 22:21:25 +09:00
parent 31169f4177
commit 86c84cc760
1 changed files with 8 additions and 2 deletions
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10
fs/smb/server/smb2pdu.c
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@ -9487,15 +9487,21 @@ int smb2_ioctl(struct ksmbd_work *work)
rsp);
break;
case FSCTL_SET_SPARSE:
if (in_buf_len < sizeof(struct file_sparse)) {
{
struct file_sparse sparse = {0};
if (in_buf_len && in_buf_len < sizeof(struct file_sparse)) {
ret = -EINVAL;
goto out;
}
ret = fsctl_set_sparse(work, id, (struct file_sparse *)buffer);
*(u8 *)&sparse = 1;
ret = fsctl_set_sparse(work, id, in_buf_len ?
(struct file_sparse *)buffer : &sparse);
if (ret < 0)
goto out;
break;
}
case FSCTL_SET_ZERO_DATA:
{
struct file_zero_data_information *zero_data;