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ksmbd: handle empty QUERY_ALLOCATED_RANGES output

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FSCTL_QUERY_ALLOCATED_RANGES can be issued with a valid input buffer but
without room for an output range.  Do not reject the request before
looking at the file layout.  If the query would produce a range, return
STATUS_BUFFER_TOO_SMALL.  If it produces no ranges, return success with an
empty output.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Namjae Jeon 2026-07-09 20:08:10 +09:00
parent 86c84cc760
commit 7f07791522
1 changed files with 12 additions and 4 deletions
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16
fs/smb/server/smb2pdu.c
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@ -9085,8 +9085,6 @@ static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
int ret = 0;
*out_count = 0;
if (in_count == 0)
return -EINVAL;
start = le64_to_cpu(qar_req->file_offset);
length = le64_to_cpu(qar_req->length);
@ -9098,8 +9096,18 @@ static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
if (!fp)
return -ENOENT;
ret = ksmbd_vfs_fqar_lseek(fp, start, length,
qar_rsp, in_count, out_count);
if (!in_count) {
struct file_allocated_range_buffer range;
ret = ksmbd_vfs_fqar_lseek(fp, start, length, &range, 1,
out_count);
if (!ret && *out_count)
ret = -ENOSPC;
*out_count = 0;
} else {
ret = ksmbd_vfs_fqar_lseek(fp, start, length,
qar_rsp, in_count, out_count);
}
if (ret && ret != -E2BIG)
*out_count = 0;