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authorQu Wenruo <wqu@suse.com>2020-08-04 15:25:47 +0800
committerDavid Sterba <dsterba@suse.com>2021-04-19 21:32:45 +0200
commit1d8ba9e7e785b6625f4d8e978e8a284b144a7077 (patch)
tree579c2d6a6aa361309241c38ac307c57be6fd6539 /fs/btrfs
parent1d68128c107a0b8c0c9125cb05d4771ddc438369 (diff)
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btrfs: handle remount to no compress during compression
[BUG] When running btrfs/071 with inode_need_compress() removed from compress_file_range(), we got the following crash: BUG: kernel NULL pointer dereference, address: 0000000000000018 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page Workqueue: btrfs-delalloc btrfs_work_helper [btrfs] RIP: 0010:compress_file_range+0x476/0x7b0 [btrfs] Call Trace: ? submit_compressed_extents+0x450/0x450 [btrfs] async_cow_start+0x16/0x40 [btrfs] btrfs_work_helper+0xf2/0x3e0 [btrfs] process_one_work+0x278/0x5e0 worker_thread+0x55/0x400 ? process_one_work+0x5e0/0x5e0 kthread+0x168/0x190 ? kthread_create_worker_on_cpu+0x70/0x70 ret_from_fork+0x22/0x30 ---[ end trace 65faf4eae941fa7d ]--- This is already after the patch "btrfs: inode: fix NULL pointer dereference if inode doesn't need compression." [CAUSE] @pages is firstly created by kcalloc() in compress_file_extent(): pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); Then passed to btrfs_compress_pages() to be utilized there: ret = btrfs_compress_pages(... pages, &nr_pages, ...); btrfs_compress_pages() will initialize each page as output, in zlib_compress_pages() we have: pages[nr_pages] = out_page; nr_pages++; Normally this is completely fine, but there is a special case which is in btrfs_compress_pages() itself: switch (type) { default: return -E2BIG; } In this case, we didn't modify @pages nor @out_pages, leaving them untouched, then when we cleanup pages, the we can hit NULL pointer dereference again: if (pages) { for (i = 0; i < nr_pages; i++) { WARN_ON(pages[i]->mapping); put_page(pages[i]); } ... } Since pages[i] are all initialized to zero, and btrfs_compress_pages() doesn't change them at all, accessing pages[i]->mapping would lead to NULL pointer dereference. This is not possible for current kernel, as we check inode_need_compress() before doing pages allocation. But if we're going to remove that inode_need_compress() in compress_file_extent(), then it's going to be a problem. [FIX] When btrfs_compress_pages() hits its default case, modify @out_pages to 0 to prevent such problem from happening. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212331 CC: stable@vger.kernel.org # 5.10+ Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/compression.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 2600703fab83..17f93fd28f7e 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -80,10 +80,15 @@ static int compression_compress_pages(int type, struct list_head *ws,
case BTRFS_COMPRESS_NONE:
default:
/*
- * This can't happen, the type is validated several times
- * before we get here. As a sane fallback, return what the
- * callers will understand as 'no compression happened'.
+ * This can happen when compression races with remount setting
+ * it to 'no compress', while caller doesn't call
+ * inode_need_compress() to check if we really need to
+ * compress.
+ *
+ * Not a big deal, just need to inform caller that we
+ * haven't allocated any pages yet.
*/
+ *out_pages = 0;
return -E2BIG;
}
}