This is a note to let you know that I've just added the patch titled crypto: ecc - Fix NULL pointer deref. on no default_rng to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: crypto-ecc-fix-null-pointer-deref.-on-no-default_rng.patch and it can be found in the queue-4.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Fri Mar 16 15:11:07 CET 2018 From: Pierre <pinaraf@xxxxxxxxxxxx> Date: Sun, 12 Nov 2017 15:24:32 +0100 Subject: crypto: ecc - Fix NULL pointer deref. on no default_rng From: Pierre <pinaraf@xxxxxxxxxxxx> [ Upstream commit 4c0e22c90510308433272d7ba281b1eb4eda8209 ] If crypto_get_default_rng returns an error, the function ecc_gen_privkey should return an error. Instead, it currently tries to use the default_rng nevertheless, thus creating a kernel panic with a NULL pointer dereference. Returning the error directly, as was supposedly intended when looking at the code, fixes this. Signed-off-by: Pierre Ducroquet <pinaraf@xxxxxxxxxxxx> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@xxxxxxxxx> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- crypto/ecc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -964,7 +964,7 @@ int ecc_gen_privkey(unsigned int curve_i * DRBG with a security strength of 256. */ if (crypto_get_default_rng()) - err = -EFAULT; + return -EFAULT; err = crypto_rng_get_bytes(crypto_default_rng, (u8 *)priv, nbytes); crypto_put_default_rng(); Patches currently in stable-queue which might be from pinaraf@xxxxxxxxxxxx are queue-4.15/crypto-ecc-fix-null-pointer-deref.-on-no-default_rng.patch