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| author | Nick Alcock <nick.alcock@oracle.com> | 2019-10-21 11:33:19 +0100 |
|---|---|---|
| committer | Nick Alcock <nick.alcock@oracle.com> | 2020-06-26 15:56:39 +0100 |
| commit | 6bbf9da8927e848d3d6fdd188ca84385f1dddcce (patch) | |
| tree | e1a74d22ddf3d9960179d6183af26bd8c7aec16a | |
| parent | fe4c2d55634c700ba527ac4183e05c66e9f93c62 (diff) | |
| download | gdb-6bbf9da8927e848d3d6fdd188ca84385f1dddcce.zip gdb-6bbf9da8927e848d3d6fdd188ca84385f1dddcce.tar.gz gdb-6bbf9da8927e848d3d6fdd188ca84385f1dddcce.tar.bz2 | |
libctf: create: don't add forwards if the type added already exists
This is what ctf_add_forward is documented to do, but it's not what it
actually does: the code is quite happy to add forwards that duplicate
existing structs, etc.
This is obviously wrong and breaks both the nondeduplicating linker
and the upcoming deduplicator, as well as allowing ordinary callers of
ctf_add_type to corrupt the dictionary by just adding the same root-
visible forward more than once.
libctf/
* ctf-create.c (ctf_add_forward): Don't add forwards to
types that already exist.
| -rw-r--r-- | libctf/ChangeLog | 5 | ||||
| -rw-r--r-- | libctf/ctf-create.c | 5 |
2 files changed, 9 insertions, 1 deletions
diff --git a/libctf/ChangeLog b/libctf/ChangeLog index 056cb7b..7868d0b 100644 --- a/libctf/ChangeLog +++ b/libctf/ChangeLog @@ -1,5 +1,10 @@ 2020-06-26 Nick Alcock <nick.alcock@oracle.com> + * ctf-create.c (ctf_add_forward): Don't add forwards to + types that already exist. + +2020-06-26 Nick Alcock <nick.alcock@oracle.com> + * ctf-open.c (init_types): Only intern root-visible types. * ctf-create.c (ctf_dtd_insert): Likewise. (ctf_dtd_delete): Only remove root-visible types. diff --git a/libctf/ctf-create.c b/libctf/ctf-create.c index e8e8028..c24a246 100644 --- a/libctf/ctf-create.c +++ b/libctf/ctf-create.c @@ -1229,7 +1229,10 @@ ctf_add_forward (ctf_file_t *fp, uint32_t flag, const char *name, if (name != NULL) type = ctf_lookup_by_rawname (fp, kind, name); - if ((type = ctf_add_generic (fp, flag, name, CTF_K_FORWARD,&dtd)) == CTF_ERR) + if (type) + return type; + + if ((type = ctf_add_generic (fp, flag, name, CTF_K_FORWARD, &dtd)) == CTF_ERR) return CTF_ERR; /* errno is set for us. */ dtd->dtd_data.ctt_info = CTF_TYPE_INFO (CTF_K_FORWARD, flag, 0); |