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| author | Arnd Bergmann <arnd@arndb.de> | 2019-07-22 15:26:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-25 11:51:30 +0300 |
| commit | dfaf368e67c3371f71220dbb7400aed6f5d59c1a (patch) | |
| tree | 5cc62746c746a284f910a1fe81695d37a5e88fa6 /drivers/block/drbd | |
| parent | 217c52217e8af93288448c01f18cf09910df11f0 (diff) | |
| download | linux-dfaf368e67c3371f71220dbb7400aed6f5d59c1a.tar.xz | |
drbd: dynamically allocate shash descriptor
[ Upstream commit 77ce56e2bfaa64127ae5e23ef136c0168b818777 ]
Building with clang and KASAN, we get a warning about an overly large
stack frame on 32-bit architectures:
drivers/block/drbd/drbd_receiver.c:921:31: error: stack frame size of 1280 bytes in function 'conn_connect'
[-Werror,-Wframe-larger-than=]
We already allocate other data dynamically in this function, so
just do the same for the shash descriptor, which makes up most of
this memory.
Link: https://lore.kernel.org/lkml/20190617132440.2721536-1-arnd@arndb.de/
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Roland Kammerer <roland.kammerer@linbit.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/block/drbd')
| -rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 83957a1e15ed..8e8e4ccb128f 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -5297,7 +5297,7 @@ static int drbd_do_auth(struct drbd_connection *connection) unsigned int key_len; char secret[SHARED_SECRET_MAX]; /* 64 byte */ unsigned int resp_size; - SHASH_DESC_ON_STACK(desc, connection->cram_hmac_tfm); + struct shash_desc *desc; struct packet_info pi; struct net_conf *nc; int err, rv; @@ -5310,6 +5310,13 @@ static int drbd_do_auth(struct drbd_connection *connection) memcpy(secret, nc->shared_secret, key_len); rcu_read_unlock(); + desc = kmalloc(sizeof(struct shash_desc) + + crypto_shash_descsize(connection->cram_hmac_tfm), + GFP_KERNEL); + if (!desc) { + rv = -1; + goto fail; + } desc->tfm = connection->cram_hmac_tfm; desc->flags = 0; @@ -5452,7 +5459,10 @@ static int drbd_do_auth(struct drbd_connection *connection) kfree(peers_ch); kfree(response); kfree(right_response); - shash_desc_zero(desc); + if (desc) { + shash_desc_zero(desc); + kfree(desc); + } return rv; } |