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authorMa Shimiao <mashimiao.fnst@cn.fujitsu.com>2017-12-12 17:39:10 +0800
committerMike Snitzer <snitzer@redhat.com>2018-01-17 09:16:16 -0500
commit4b259fc4a8a12dcd0ffd670877a7a1ca2ab0f3e3 (patch)
tree948cf6d3629f6ce40f142532faaca9121c2d65f3 /drivers/md
parentd5ffebdd797a7c1c89576267640f671db2a668fc (diff)
downloadlinux-4b259fc4a8a12dcd0ffd670877a7a1ca2ab0f3e3.tar.bz2
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>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-log-writes.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 189badbeddaf..3362d866793b 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -594,7 +594,7 @@ static int log_mark(struct log_writes_c *lc, char *data)
return -ENOMEM;
}
- block->data = kstrndup(data, maxsize, GFP_KERNEL);
+ block->data = kstrndup(data, maxsize - 1, GFP_KERNEL);
if (!block->data) {
DMERR("Error copying mark data");
kfree(block);