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authorAndy Grover <agrover@redhat.com>2016-11-21 16:35:30 -0800
committerBart Van Assche <bart.vanassche@sandisk.com>2016-12-15 16:34:58 +0100
commitd0905ca757bc40bd1ebc261a448a521b064777d7 (patch)
treeb1a44e58386d0be4b2d49534dcac50c7e36b29ac /drivers/target
parent8dcf07be2d0bcbfcebc49b9451a4feaf83e3428b (diff)
downloadlinux-d0905ca757bc40bd1ebc261a448a521b064777d7.tar.bz2
target/user: Fix use-after-free of tcmu_cmds if they are expired
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>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_user.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
index 1bf1d37aa2e3..2e331008d30b 100644
--- a/drivers/target/target_core_user.c
+++ b/drivers/target/target_core_user.c
@@ -686,8 +686,6 @@ 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;
}