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authorDavid Sterba <dsterba@suse.com>2021-10-27 11:39:03 +0300
committerDavid Sterba <dsterba@suse.com>2021-10-27 11:39:03 +0300
commit3a60f6537c9adf0828bf1dd868c59f659395257e (patch)
tree91badc6240f4bdaae0653b087242cb8510f47c52 /fs/btrfs/compression.c
parent4afb912f439c4bc4e6a4f3e7547f2e69e354108f (diff)
downloadlinux-3a60f6537c9adf0828bf1dd868c59f659395257e.tar.xz
Revert "btrfs: compression: drop kmap/kunmap from generic helpers"
This reverts commit 4c2bf276b56d8d27ddbafcdf056ef3fc60ae50b0. The kmaps in compression code are still needed and cause crashes on 32bit machines (ARM, x86). Reproducible eg. by running fstest btrfs/004 with enabled LZO or ZSTD compression. Link: https://lore.kernel.org/all/CAJCQCtT+OuemovPO7GZk8Y8=qtOObr0XTDp8jh4OHD6y84AFxw@mail.gmail.com/ Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=214839 Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/compression.c')
-rw-r--r--fs/btrfs/compression.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 7869ad12bc6e..0913ee50e6c3 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -172,9 +172,10 @@ static int check_compressed_csum(struct btrfs_inode *inode, struct bio *bio,
/* Hash through the page sector by sector */
for (pg_offset = 0; pg_offset < bytes_left;
pg_offset += sectorsize) {
- kaddr = page_address(page);
+ kaddr = kmap_atomic(page);
crypto_shash_digest(shash, kaddr + pg_offset,
sectorsize, csum);
+ kunmap_atomic(kaddr);
if (memcmp(&csum, cb_sum, csum_size) != 0) {
btrfs_print_data_csum_error(inode, disk_start,