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copy: fix COPY_CHUNK border crossing

This commit is contained in:
Thomas Schoebel-Theuer 2022-06-15 21:37:23 +02:00
parent 1932198fd9
commit b6a5ee3227
1 changed files with 8 additions and 6 deletions
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14
kernel/mars_copy.c
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@ -324,6 +324,7 @@ int _make_mref(struct copy_brick *brick,
const unsigned queue = _queue;
unsigned input_index;
unsigned offset;
unsigned max_len;
unsigned len;
int status = -EAGAIN;
@ -393,12 +394,13 @@ int _make_mref(struct copy_brick *brick,
mref->ref_data = data;
mref->ref_pos = current_pos;
offset = GET_OFFSET(current_pos);
len = COPY_CHUNK - offset;
if (current_pos + len > end_pos) {
unsigned new_len = end_pos - current_pos;
if (new_len < len)
len = new_len;
max_len = COPY_CHUNK - offset;
/* higher end values than 2GiB may occur at big devices */
if (diff > COPY_CHUNK)
diff = COPY_CHUNK;
len = diff;
if (len > max_len) {
len = max_len;
}
mref->ref_len = len;
mref->ref_prio = (flags & MREF_WRITE) ?