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authorVakul Garg <vakul.garg@nxp.com>2018-09-06 21:41:40 +0530
committerDavid S. Miller <davem@davemloft.net>2018-09-09 08:10:01 -0700
commit52ea992cfac357b73180d5c051dca43bc8d20c2a (patch)
tree032f87084cff484a3ddd203027856790faefefdb
parent0e1f4c76be241377d282e34ebea6d16ff7829747 (diff)
net/tls: Set count of SG entries if sk_alloc_sg returns -ENOSPC
tls_sw_sendmsg() allocates plaintext and encrypted SG entries using function sk_alloc_sg(). In case the number of SG entries hit MAX_SKB_FRAGS, sk_alloc_sg() returns -ENOSPC and sets the variable for current SG index to '0'. This leads to calling of function tls_push_record() with 'sg_encrypted_num_elem = 0' and later causes kernel crash. To fix this, set the number of SG elements to the number of elements in plaintext/encrypted SG arrays in case sk_alloc_sg() returns -ENOSPC. Fixes: 3c4d7559159b ("tls: kernel TLS support") Signed-off-by: Vakul Garg <vakul.garg@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/tls/tls_sw.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 52fbe727d7c1..e28a6ff25d96 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -125,6 +125,9 @@ static int alloc_encrypted_sg(struct sock *sk, int len)
&ctx->sg_encrypted_num_elem,
&ctx->sg_encrypted_size, 0);
+ if (rc == -ENOSPC)
+ ctx->sg_encrypted_num_elem = ARRAY_SIZE(ctx->sg_encrypted_data);
+
return rc;
}
@@ -138,6 +141,9 @@ static int alloc_plaintext_sg(struct sock *sk, int len)
&ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size,
tls_ctx->pending_open_record_frags);
+ if (rc == -ENOSPC)
+ ctx->sg_plaintext_num_elem = ARRAY_SIZE(ctx->sg_plaintext_data);
+
return rc;
}