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libctf: fix ref leak of names of newly-inserted non-root-visible types

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A bug in ctf_dtd_delete led to refs in the string table to the
names of non-root-visible types not being removed when the DTD
was.  This seems harmless, but actually it would lead to a write
down a pointer into freed memory if such a type was ctf_rollback()ed
over and then the dict was serialized (updating all the refs as the
strtab was serialized in turn).

Bug introduced in commit fe4c2d5563
("libctf: create: non-root-visible types should not appear in name tables")
which is included in binutils 2.35.

libctf/
	* ctf-create.c (ctf_dtd_delete): Remove refs for all types
	with names, not just root-visible ones.
This commit is contained in:
Nick Alcock 2024-07-29 12:45:09 +01:00
parent a648fe3073
commit 81900d2bac
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1 changed files with 4 additions and 4 deletions
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8
libctf/ctf-create.c
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@ -288,11 +288,11 @@ ctf_dtd_delete (ctf_dict_t *fp, ctf_dtdef_t *dtd)
dtd->dtd_vlen_alloc = 0;
if (dtd->dtd_data.ctt_name
&& (name = ctf_strraw (fp, dtd->dtd_data.ctt_name)) != NULL
&& LCTF_INFO_ISROOT (fp, dtd->dtd_data.ctt_info))
&& (name = ctf_strraw (fp, dtd->dtd_data.ctt_name)) != NULL)
{
ctf_dynhash_remove (ctf_name_table (fp, name_kind)->ctn_writable,
name);
if (LCTF_INFO_ISROOT (fp, dtd->dtd_data.ctt_info))
ctf_dynhash_remove (ctf_name_table (fp, name_kind)->ctn_writable,
name);
ctf_str_remove_ref (fp, name, &dtd->dtd_data.ctt_name);
}