From: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> To: <agk@redhat.com>, <snitzer@redhat.com>, <dm-devel@redhat.com> Cc: <linux-kernel@vger.kernel.org>, Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> Subject: [PATCH] drviers/md: fix max dup length for kstrndup Date: Tue, 12 Dec 2017 17:39:10 +0800 [thread overview] Message-ID: <20171212093910.21743-1-mashimiao.fnst@cn.fujitsu.com> (raw) If source string longer than max, kstrndup will alloc max+1 space. So, we should make sure the result will not over limit. Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> --- drivers/md/dm-log-writes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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); -- 2.13.6
WARNING: multiple messages have this Message-ID (diff)
From: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> To: agk@redhat.com, snitzer@redhat.com, dm-devel@redhat.com Cc: linux-kernel@vger.kernel.org, Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> Subject: [PATCH] drviers/md: fix max dup length for kstrndup Date: Tue, 12 Dec 2017 17:39:10 +0800 [thread overview] Message-ID: <20171212093910.21743-1-mashimiao.fnst@cn.fujitsu.com> (raw) If source string longer than max, kstrndup will alloc max+1 space. So, we should make sure the result will not over limit. Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> --- drivers/md/dm-log-writes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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); -- 2.13.6
next reply other threads:[~2017-12-12 9:38 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-12-12 9:39 Ma Shimiao [this message] 2017-12-12 9:39 ` [PATCH] drviers/md: fix max dup length for kstrndup Ma Shimiao
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