fs: btrfs: Fix unaligned memory accesses
Loading files stored with lzo compression from a btrfs filesystem was
producing unaligned memory accesses, which were causing a data abort
and a reset on an Orange Pi Zero.
The change in hash.c is not triggered by any error but follows the
same pattern. Please confirm.
Fixed according to doc/README.unaligned-memory-access.txt
Signed-off-by: Alberto Sánchez Molero <alsamolero@gmail.com>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index a59ff5a..b1b4498 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -9,6 +9,7 @@
#include "btrfs.h"
#include <linux/lzo.h>
#include <u-boot/zlib.h>
+#include <asm/unaligned.h>
static u32 decompress_lzo(const u8 *cbuf, u32 clen, u8 *dbuf, u32 dlen)
{
@@ -19,7 +20,7 @@
if (clen < 4)
return -1;
- tot_len = le32_to_cpu(*(u32 *) cbuf);
+ tot_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
cbuf += 4;
clen -= 4;
tot_len -= 4;
@@ -32,7 +33,7 @@
res = 0;
while (tot_len > 4) {
- in_len = le32_to_cpu(*(u32 *) cbuf);
+ in_len = le32_to_cpu(get_unaligned((u32 *)cbuf));
cbuf += 4;
clen -= 4;