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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-01-13 11:26:18 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-02 08:28:12 -0800 |
| commit | d493ba54d96d117fb3dff027141444584f852054 (patch) | |
| tree | 8d493b7284107d16f46d1744673f9cb7f81739cd | |
| parent | e230bf234f40f493a284c4dbcec0b331529b609f (diff) | |
| download | lwn-d493ba54d96d117fb3dff027141444584f852054.tar.gz lwn-d493ba54d96d117fb3dff027141444584f852054.zip | |
crypto: authenc - Fix zero-length IV crash
commit 29b37f42127f7da511560a40ea74f5047da40c13 upstream.
As it is if an algorithm with a zero-length IV is used (e.g.,
NULL encryption) with authenc, authenc may generate an SG entry
of length zero, which will trigger a BUG check in the hash layer.
This patch fixes it by skipping the IV SG generation if the IV
size is zero.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | crypto/authenc.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/crypto/authenc.c b/crypto/authenc.c index fd9f06c63d76..0861dc2289dd 100644 --- a/crypto/authenc.c +++ b/crypto/authenc.c @@ -157,16 +157,19 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, dstp = sg_page(dst); vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; - sg_init_table(cipher, 2); - sg_set_buf(cipher, iv, ivsize); - authenc_chain(cipher, dst, vdst == iv + ivsize); + if (ivsize) { + sg_init_table(cipher, 2); + sg_set_buf(cipher, iv, ivsize); + authenc_chain(cipher, dst, vdst == iv + ivsize); + dst = cipher; + } cryptlen = req->cryptlen + ivsize; - hash = crypto_authenc_hash(req, flags, cipher, cryptlen); + hash = crypto_authenc_hash(req, flags, dst, cryptlen); if (IS_ERR(hash)) return PTR_ERR(hash); - scatterwalk_map_and_copy(hash, cipher, cryptlen, + scatterwalk_map_and_copy(hash, dst, cryptlen, crypto_aead_authsize(authenc), 1); return 0; } @@ -284,11 +287,14 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, srcp = sg_page(src); vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; - sg_init_table(cipher, 2); - sg_set_buf(cipher, iv, ivsize); - authenc_chain(cipher, src, vsrc == iv + ivsize); + if (ivsize) { + sg_init_table(cipher, 2); + sg_set_buf(cipher, iv, ivsize); + authenc_chain(cipher, src, vsrc == iv + ivsize); + src = cipher; + } - return crypto_authenc_verify(req, cipher, cryptlen + ivsize); + return crypto_authenc_verify(req, src, cryptlen + ivsize); } static int crypto_authenc_decrypt(struct aead_request *req) |