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crypto: algif_skcipher - only call put_page on referenced and used pages
For asynchronous operation, SGs are allocated without a page mapped to them or with a page that is not used (ref-counted). If the SGL is freed, the code must only call put_page for an SG if there was a page assigned and ref-counted in the first place. This fixes a kernel crash when using io_submit with more than one iocb using the sendmsg and sendpage (vmsplice/splice) interface. Cc: <stable@vger.kernel.org> Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -87,8 +87,13 @@ static void skcipher_free_async_sgls(struct skcipher_async_req *sreq)
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}
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sgl = sreq->tsg;
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n = sg_nents(sgl);
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for_each_sg(sgl, sg, n, i)
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put_page(sg_page(sg));
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for_each_sg(sgl, sg, n, i) {
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struct page *page = sg_page(sg);
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/* some SGs may not have a page mapped */
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if (page && page_ref_count(page))
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put_page(page);
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}
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kfree(sreq->tsg);
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}
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