The commit f7866c3587337731 ("bpf: Fix null pointer dereference in
resolve_prog_type() for BPF_PROG_TYPE_EXT") fixed a NULL pointer
dereference panic, but didn't fix the issue that fails to update attached
freplace prog to prog_array map.
This patch fixes the issue.
v1 -> v2:
* Address comments from Yonghong:
* Check then return prog->aux->saved_dst_prog_type.
* Remove ASSERT_GE() that checks prog_fd and map_fd.
* Remove #include "bpf_legacy.h".
* Fix some code style issues.
RFC PATCH -> v1:
* Respin the PATCH with updated message.
Links:
[0] https://lore.kernel.org/bpf/20240602122421.50892-1-hffilwlqm@xxxxxxxxx/
Leon Hwang (2):
bpf: Fix updating attached freplace prog to prog_array map
selftests/bpf: Add testcase for updating attached freplace prog to
prog_array map
include/linux/bpf_verifier.h | 4 +-
.../selftests/bpf/prog_tests/tailcalls.c | 65 ++++++++++++++++++-
.../selftests/bpf/progs/tailcall_freplace.c | 25 +++++++
.../testing/selftests/bpf/progs/tc_bpf2bpf.c | 21 ++++++
4 files changed, 112 insertions(+), 3 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/tailcall_freplace.c
create mode 100644 tools/testing/selftests/bpf/progs/tc_bpf2bpf.c
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2.44.0
