6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nivas Varadharajan Mugunthakumar nivasx.varadharajan.mugunthakumar@intel.com
[ Upstream commit 6424da7d8b938fe66e7e771eaa949bc7b6c29c00 ]
The function adf_cfg_add_key_value_param() attempts to access and modify the key value store of the driver without locking.
Extend the scope of cfg->lock to avoid a potential race condition.
Fixes: 92bf269fbfe9 ("crypto: qat - change behaviour of adf_cfg_add_key_value_param()") Signed-off-by: Nivas Varadharajan Mugunthakumar nivasx.varadharajan.mugunthakumar@intel.com Signed-off-by: Giovanni Cabiddu giovanni.cabiddu@intel.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/qat/qat_common/adf_cfg.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/crypto/qat/qat_common/adf_cfg.c b/drivers/crypto/qat/qat_common/adf_cfg.c index 1931e5b37f2bd..368d14d81503c 100644 --- a/drivers/crypto/qat/qat_common/adf_cfg.c +++ b/drivers/crypto/qat/qat_common/adf_cfg.c @@ -276,17 +276,19 @@ int adf_cfg_add_key_value_param(struct adf_accel_dev *accel_dev, * 3. if the key exists with the same value, then return without doing * anything (the newly created key_val is freed). */ + down_write(&cfg->lock); if (!adf_cfg_key_val_get(accel_dev, section_name, key, temp_val)) { if (strncmp(temp_val, key_val->val, sizeof(temp_val))) { adf_cfg_keyval_remove(key, section); } else { kfree(key_val); - return 0; + goto out; } }
- down_write(&cfg->lock); adf_cfg_keyval_add(key_val, section); + +out: up_write(&cfg->lock); return 0; }