[bpf-next,0/3] potential memleak and use after free in bpf verifier

Message

He Fengqing July 7, 2021, 4:38 a.m. UTC

While reading the code of bpf verifier, I found these two issues.
Patch 1 move the bpf_prog_clone_free function into filter.h, so
we can use it in other file. Patch 2 fix memleak in an error
handling path in bpf_patch_insn_data function.
Patch 3 fix a use after free in bpf_check function.

He Fengqing (3):
  bpf: Move bpf_prog_clone_free into filter.h file
  bpf: Fix a memory leak in an error handling path in
    'bpf_patch_insn_data()'
  bpf: Fix a use after free in bpf_check()

 include/linux/filter.h | 17 ++++++++++++-
 kernel/bpf/core.c      | 27 +++++---------------
 kernel/bpf/verifier.c  | 58 ++++++++++++++++++++++++++++++++----------
 net/core/filter.c      |  2 +-
 4 files changed, 68 insertions(+), 36 deletions(-)