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tls: Correct length of scatterlist in tls_sw_sendpage
The scatterlist is reused by both sendmsg and sendfile. If a sendmsg of smaller number of pages is followed by a sendfile of larger number of pages, the scatterlist may be too short, resulting in a crash in gcm_encrypt. Add sg_unmark_end to make the list the correct length. tls_sw_sendmsg already calls sg_unmark_end correctly when it allocates memory in alloc_sg, or in zerocopy_from_iter. Signed-off-by: Dave Watson <davejwatson@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -577,6 +577,8 @@ alloc_payload:
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get_page(page);
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sg = ctx->sg_plaintext_data + ctx->sg_plaintext_num_elem;
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sg_set_page(sg, page, copy, offset);
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sg_unmark_end(sg);
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ctx->sg_plaintext_num_elem++;
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sk_mem_charge(sk, copy);
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