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| author | David Faust <david.faust@oracle.com> | 2024-11-07 09:27:07 -0800 |
|---|---|---|
| committer | David Faust <david.faust@oracle.com> | 2024-11-07 09:58:03 -0800 |
| commit | 0e1382034246a594f1da8dbaee97c4a06743f31a (patch) | |
| tree | a2ff8c294231a5f26f280b4ed507d01745b69755 | |
| parent | 6571e8f863736b7705f59c9ab0f17b7c4fdbcf92 (diff) | |
| download | gcc-0e1382034246a594f1da8dbaee97c4a06743f31a.zip gcc-0e1382034246a594f1da8dbaee97c4a06743f31a.tar.gz gcc-0e1382034246a594f1da8dbaee97c4a06743f31a.tar.bz2 | |
bpf: avoid possible null deref in btf_ext_output [PR target/117447]
The BPF-specific .BTF.ext section is always generated for BPF programs
if -gbtf is specified, and generating it requires BTF information and
assumes that the BTF info has already been generated.
Compiling non-C languages to BPF is not supported, nor is generating
CTF/BTF for non-C. But, compiling another language like C++ to BPF
with -gbtf specified meant that we would try to generate the .BTF.ext
section anyway, and then ICE because no BTF information was available.
Add a check to bail out of btf_ext_output if the TU CTFC does not exist,
meaning no BTF info is available.
gcc/
PR target/117447
* config/bpf/btfext-out.cc (btf_ext_output): Bail if TU CTFC is null.
| -rw-r--r-- | gcc/config/bpf/btfext-out.cc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/config/bpf/btfext-out.cc b/gcc/config/bpf/btfext-out.cc index ca6241a..760b2b5 100644 --- a/gcc/config/bpf/btfext-out.cc +++ b/gcc/config/bpf/btfext-out.cc @@ -611,6 +611,9 @@ btf_ext_init (void) void btf_ext_output (void) { + if (!ctf_get_tu_ctfc ()) + return; + output_btfext_header (); output_btfext_func_info (btf_ext); if (TARGET_BPF_CORE) |