If get_unused_fd_flags() fails, the error handling is incomplete
because bprm->cred is already set to NULL, and therefore
free_bprm will not unlock the cred_guard_mutex.
Note there are two error conditions which end up here,
one before and one after bprm->cred is cleared.
Fixes: b8a61c9e7b4 ("exec: Generic execfd support")
Signed-off-by: Bernd Edlinger <bernd.edlinger@xxxxxxxxxx>
---
fs/exec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/exec.c b/fs/exec.c
index 18594f1..d8af85f 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1396,6 +1396,9 @@ int begin_new_exec(struct linux_binprm * bprm)
out_unlock:
up_write(&me->signal->exec_update_lock);
+ if (!bprm->cred)
+ mutex_unlock(&me->signal->cred_guard_mutex);
+
out:
return retval;
}
--
1.9.1
