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| author | Stephan Mueller <smueller@chronox.de> | 2017-08-10 16:40:03 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-22 15:03:27 +0800 |
| commit | 2d45a7e89833f88b38112292ff227af437f81f2f (patch) | |
| tree | eccc3beb0adf527562a4ea61d5aafccea919c24a /crypto | |
| parent | 32e67b9af077e905388f1746bf429ea0c39b6917 (diff) | |
| download | linux-2d45a7e89833f88b38112292ff227af437f81f2f.tar.bz2 | |
crypto: af_alg - get_page upon reassignment to TX SGL
When a page is assigned to a TX SGL, call get_page to increment the
reference counter. It is possible that one page is referenced in
multiple SGLs:
- in the global TX SGL in case a previous af_alg_pull_tsgl only
reassigned parts of a page to a per-request TX SGL
- in the per-request TX SGL as assigned by af_alg_pull_tsgl
Note, multiple requests can be active at the same time whose TX SGLs all
point to different parts of the same page.
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/af_alg.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c index d6936c0e08d9..ffa9f4ccd9b4 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -641,9 +641,9 @@ void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, if (dst_offset >= plen) { /* discard page before offset */ dst_offset -= plen; - put_page(page); } else { /* reassign page to dst after offset */ + get_page(page); sg_set_page(dst + j, page, plen - dst_offset, sg[i].offset + dst_offset); @@ -661,9 +661,7 @@ void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, if (sg[i].length) return; - if (!dst) - put_page(page); - + put_page(page); sg_assign_page(sg + i, NULL); } |