On Mon, Nov 27, 2017 at 11:29:44PM -0800, Eric Biggers wrote: > > >From 453b54793e843c0d5b8fd2d5e33fcc5427ec038e Mon Sep 17 00:00:00 2001 > From: Eric Biggers <ebiggers@xxxxxxxxxx> > Date: Mon, 27 Nov 2017 23:23:05 -0800 > Subject: [PATCH] crypto: algif_aead - fix reference counting of null skcipher > > In the AEAD interface for AF_ALG, the reference to the "null skcipher" > held by each tfm was being dropped in the wrong place -- when each > af_alg_ctx was freed instead of when the aead_tfm was freed. As > discovered by syzkaller, a specially crafted program could use this to > cause the null skcipher to be freed while it is still in use. > > Fix it by dropping the reference in the right place. > > Fixes: 72548b093ee3 ("crypto: algif_aead - copy AAD from src to dst") > Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> # v4.14+ > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> Patch applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt