diff options
Diffstat (limited to 'arch/s390/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/s390/net/bpf_jit_comp.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index d0846ba818ee..6b1876e4ad3f 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -539,7 +539,7 @@ static void bpf_jit_plt(void *plt, void *ret, void *target) { memcpy(plt, bpf_plt, BPF_PLT_SIZE); *(void **)((char *)plt + (bpf_plt_ret - bpf_plt)) = ret; - *(void **)((char *)plt + (bpf_plt_target - bpf_plt)) = target; + *(void **)((char *)plt + (bpf_plt_target - bpf_plt)) = target ?: ret; } /* @@ -2010,7 +2010,9 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, } __packed insn; char expected_plt[BPF_PLT_SIZE]; char current_plt[BPF_PLT_SIZE]; + char new_plt[BPF_PLT_SIZE]; char *plt; + char *ret; int err; /* Verify the branch to be patched. */ @@ -2032,12 +2034,15 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t, err = copy_from_kernel_nofault(current_plt, plt, BPF_PLT_SIZE); if (err < 0) return err; - bpf_jit_plt(expected_plt, (char *)ip + 6, old_addr); + ret = (char *)ip + 6; + bpf_jit_plt(expected_plt, ret, old_addr); if (memcmp(current_plt, expected_plt, BPF_PLT_SIZE)) return -EINVAL; /* Adjust the call address. */ + bpf_jit_plt(new_plt, ret, new_addr); s390_kernel_write(plt + (bpf_plt_target - bpf_plt), - &new_addr, sizeof(void *)); + new_plt + (bpf_plt_target - bpf_plt), + sizeof(void *)); } /* Adjust the mask of the branch. */ |