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Subject[PATCH] net/tls: Fix kmap usage
Date
From: Ira Weiny <ira.weiny@intel.com>

When MSG_OOB is specified to tls_device_sendpage() the mapped page is
never unmapped.

Hold off mapping the page until after the flags are checked and the page
is actually needed.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
net/tls/tls_device.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 0e55f8365ce2..0cbad566f281 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -561,7 +561,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct iov_iter msg_iter;
- char *kaddr = kmap(page);
+ char *kaddr;
struct kvec iov;
int rc;

@@ -576,6 +576,7 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
goto out;
}

+ kaddr = kmap(page);
iov.iov_base = kaddr + offset;
iov.iov_len = size;
iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
--
2.28.0.rc0.12.gb6a658bd00c9
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