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| author |   Coly Li <colyli@suse.de> | 2021-11-03 23:10:41 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-11-08 06:23:17 -0700 |
| commit | 2878feaed543c35f9dbbe6d8ce36fb67ac803eef (patch) | |
| tree | 18fb4a6a9867c61126be18ff6cc44358de82f06b /drivers/md | |
| parent | ataflop: Add missing semicolon to return statement (diff) | |
| download | linux-dev-2878feaed543c35f9dbbe6d8ce36fb67ac803eef.tar.xz linux-dev-2878feaed543c35f9dbbe6d8ce36fb67ac803eef.zip | |
bcache: Revert "bcache: use bvec_virt"
This reverts commit 2fd3e5efe791946be0957c8e1eed9560b541fe46.
The above commit replaces page_address(bv->bv_page) by bvec_virt(bv) to
avoid directly access to bv->bv_page, but in situation bv->bv_offset is
not zero and page_address(bv->bv_page) is not equal to bvec_virt(bv). In
such case a memory corruption may happen because memory in next page is
tainted by following line in do_btree_node_write(),
memcpy(bvec_virt(bv), addr, PAGE_SIZE);
This patch reverts the mentioned commit to avoid the memory corruption.
Fixes: 2fd3e5efe791 ("bcache: use bvec_virt")
Signed-off-by: Coly Li <colyli@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 5.15
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211103151041.70516-1-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/btree.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 93b67b8d31c3..88c573eeb598 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -378,7 +378,7 @@ static void do_btree_node_write(struct btree *b) struct bvec_iter_all iter_all; bio_for_each_segment_all(bv, b->bio, iter_all) { - memcpy(bvec_virt(bv), addr, PAGE_SIZE); + memcpy(page_address(bv->bv_page), addr, PAGE_SIZE); addr += PAGE_SIZE; } |