UBIFS: correct data corruption range

With power-cut emulation, it is possible that sometimes no data at all is
corrupted and that confusing messages are printed due to errors in the
computation of data corruption range.

[1] The start of the range should be [0..len-1], not [0..len].
[2] The end of the range should always be at least 1 greater than the start.

Signed-off-by: Mats Karrman <mats.karrman@tritech.se>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 6e025e02ffde..cc1febd8fadf 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2563,9 +2563,9 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf,
         unsigned int from, to, ffs = chance(1, 2);
         unsigned char *p = (void *)buf;
 
-        from = prandom_u32() % (len + 1);
-        /* Corruption may only span one max. write unit */
-        to = min(len, ALIGN(from, c->max_write_size));
+        from = prandom_u32() % len;
+        /* Corruption span max to end of write unit */
+        to = min(len, ALIGN(from + 1, c->max_write_size));
 
         ubifs_warn("filled bytes %u-%u with %s", from, to - 1,
                    ffs ? "0xFFs" : "random data");