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authorMats Kärrman <Mats.Karrman@tritech.se>2013-08-21 13:24:49 +0000
committerArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2013-10-26 11:33:38 +0100
commit58a4e23703b22c331b01fbd0c12161aadaa6d50b (patch)
treeb7fde07e8a87483be5d9398d3a8f7b2e1e75f5b2 /fs/ubifs
parent7203db97b7378c2571797c13aa89327a2c487ea1 (diff)
downloadlinux-58a4e23703b22c331b01fbd0c12161aadaa6d50b.tar.bz2
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>
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/debug.c6
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");