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dm log writes: fix max length used for kstrndup 

If source string is longer than max, kstrndup will allocate max+1
space.  So make sure the result will not exceed max.

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Ma Shimiao 2017-12-12 17:39:10 +08:00 committed by Mike Snitzer
parent d5ffebdd79
commit 4b259fc4a8
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-log-writes.c
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@ -594,7 +594,7 @@ static int log_mark(struct log_writes_c *lc, char *data)
return -ENOMEM; return -ENOMEM;
} }
block->data = kstrndup(data, maxsize, GFP_KERNEL); block->data = kstrndup(data, maxsize - 1, GFP_KERNEL);
if (!block->data) { if (!block->data) {
DMERR("Error copying mark data"); DMERR("Error copying mark data");
kfree(block); kfree(block);