selftests/sched_ext: Check skeleton open failure in exit test

exit.c does not check the return value of exit__open(). If it returns
NULL, which happens when the skeleton wrapper fails to allocate the
object or open the BPF ELF, the very next line dereferences it via
SCX_ENUM_INIT(). That macro expands to SCX_ENUM_SET(), which accesses
skel->rodata, causing a NULL pointer dereference.

Every other selftest guards this with SCX_FAIL_IF(!skel, ...); exit.c
is the only one missing it.

Fixes: a5db7817af78 ("sched_ext: Add selftests")
Signed-off-by: Liang Luo <luoliang@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

0 files changed, 0 insertions, 0 deletions