diff options
| author | Andy Grover <agrover@redhat.com> | 2016-11-21 16:35:30 -0800 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-01-15 09:49:52 -0500 |
| commit | fcc5da2cf67993e96c9a9b3132775af11c0104ce (patch) | |
| tree | 75ffc6a1427b5296ff31131c6e5668ecefbe656b | |
| parent | 3386c47bc80bf56dd8b6cdf5a85f5436da54e1aa (diff) | |
target/user: Fix use-after-free of tcmu_cmds if they are expired
[ Upstream commit d0905ca757bc40bd1ebc261a448a521b064777d7 ]
Don't free the cmd in tcmu_check_expired_cmd, it's still referenced by
an entry in our cmd_id->cmd idr. If userspace ever resumes processing,
tcmu_handle_completions() will use the now-invalid cmd pointer.
Instead, don't free cmd. It will be freed by tcmu_handle_completion() if
userspace ever recovers, or tcmu_free_device if not.
Cc: stable@vger.kernel.org
Reported-by: Bryant G Ly <bgly@us.ibm.com>
Tested-by: Bryant G Ly <bgly@us.ibm.com>
Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
| -rw-r--r-- | drivers/target/target_core_user.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 9a1b314f6482..90e55b469c1e 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -587,8 +587,6 @@ static int tcmu_check_expired_cmd(int id, void *p, void *data) target_complete_cmd(cmd->se_cmd, SAM_STAT_CHECK_CONDITION); cmd->se_cmd = NULL; - kmem_cache_free(tcmu_cmd_cache, cmd); - return 0; } |