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MDEV-12632: Source and destination overlap in memcpy, encryption.innodb-discard-import-change fails in buildbot with valgrind

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Problem was that if tablespace was encrypted we try to copy
also page 0 from read buffer to write buffer that are in
that case the same memory area.

fil_iterate
	When tablespace is encrypted or compressed its
        first page (i.e. page 0) is not encrypted or
	compressed and there is no need to copy buffer.
This commit is contained in:
Jan Lindström 2018-04-12 11:00:48 +03:00
parent 91245909a2
commit 9c42b9038d
1 changed files with 10 additions and 4 deletions
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14
storage/innobase/row/row0import.cc
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@ -3348,12 +3348,12 @@ fil_iterate(
bool updated = false;
os_offset_t page_off = offset;
ulint n_pages_read = n_bytes / size;
bool decrypted = false;
block->page.id.set_page_no(ulint(page_off / size));
for (ulint i = 0; i < n_pages_read;
block->page.id.set_page_no(block->page.id.page_no() + 1),
++i, page_off += size, block->frame += size) {
bool decrypted = false;
err = DB_SUCCESS;
byte* src = readptr + i * size;
byte* dst = io_buffer + i * size;
@ -3400,6 +3400,7 @@ fil_iterate(
block->frame = src;
frame_changed = true;
} else {
ut_ad(dst != src);
memcpy(dst, src, size);
}
}
@ -3459,9 +3460,13 @@ page_corrupted:
ut_ad(encrypted ?
src != dst && dst != writeptr + (i * size):1);
if (encrypted) {
memcpy(writeptr + (i * size),
callback.get_frame(block), size);
/* When tablespace is encrypted or compressed its
first page (i.e. page 0) is not encrypted or
compressed and there is no need to copy frame. */
if (encrypted && i != 0) {
byte *local_frame = callback.get_frame(block);
ut_ad((writeptr + (i * size)) != local_frame);
memcpy((writeptr + (i * size)), local_frame, size);
}
if (frame_changed) {
@ -3499,6 +3504,7 @@ page_corrupted:
if (tmp == src) {
/* TODO: remove unnecessary memcpy's */
ut_ad(dest != src);
memcpy(dest, src, size);
}