[PATCH 1/2] RISC-V: Release subset lists on all paths when the linker merges arch attributes

[Nelson Chu]

Sorry, forgot to commit.  Committed, thanks.

Nelson

On Tue, Jul 7, 2026 at 9:01 AM Nelson Chu <nelson.chu@sifive.com> wrote:

> This looks Okay, thanks.
>
> Nelson
>
> On Mon, Jul 6, 2026 at 7:46 PM Ethan Y. C. Liang <ycl669@andestech.com>
> wrote:
>
>> riscv_merge_arch_attr_info returned early on the error paths without
>> releasing in_subsets, out_subsets and merged_subsets, so the nodes
>> already added to them were leaked.  The leaked nodes of in_subsets
>> and out_subsets also carry over into the next merge.
>>
>> Route every post-parse error path through a single cleanup exit that
>> releases all three subset lists, and drop the now-redundant reset of
>> merged_subsets at entry.
>> ---
>>  bfd/elfxx-riscv.c | 21 +++++++++++----------
>>  1 file changed, 11 insertions(+), 10 deletions(-)
>>
>> diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
>> index 961c44a9206..fa2f1759f31 100644
>> --- a/bfd/elfxx-riscv.c
>> +++ b/bfd/elfxx-riscv.c
>> @@ -3691,10 +3691,9 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>  {
>>    riscv_subset_t *in, *out;
>>    static char *merged_arch_str = NULL;
>> +  char *result = NULL;
>>
>>    unsigned xlen_in, xlen_out;
>> -  merged_subsets.head = NULL;
>> -  merged_subsets.tail = NULL;
>>
>>    riscv_parse_subset_t riscv_rps_ld_in =
>>      {&in_subsets, _bfd_error_handler, &xlen_in, NULL, false};
>> @@ -3710,9 +3709,9 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>
>>    /* Parse subset from ISA string.  */
>>    if (!riscv_parse_subset (&riscv_rps_ld_in, in_arch))
>> -    return NULL;
>> +    goto cleanup;
>>    if (!riscv_parse_subset (&riscv_rps_ld_out, out_arch))
>> -    return NULL;
>> +    goto cleanup;
>>
>>    /* Checking XLEN.  */
>>    if (xlen_out != xlen_in)
>> @@ -3720,7 +3719,7 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>        _bfd_error_handler
>>         (_("error: %pB: ISA string of input (%s) doesn't match "
>>            "output (%s)"), ibfd, in_arch, out_arch);
>> -      return NULL;
>> +      goto cleanup;
>>      }
>>
>>    /* Merge subset list.  */
>> @@ -3729,18 +3728,18 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>
>>    /* Merge standard extension.  */
>>    if (!riscv_merge_std_ext (ibfd, in_arch, out_arch, &in, &out))
>> -    return NULL;
>> +    goto cleanup;
>>
>>    /* Merge all non-single letter extensions with single call.  */
>>    if (!riscv_merge_multi_letter_ext (&in, &out))
>> -    return NULL;
>> +    goto cleanup;
>>
>>    if (xlen_in != xlen_out)
>>      {
>>        _bfd_error_handler
>>         (_("error: %pB: XLEN of input (%u) doesn't match "
>>            "output (%u)"), ibfd, xlen_in, xlen_out);
>> -      return NULL;
>> +      goto cleanup;
>>      }
>>
>>    if (xlen_in != arch_size)
>> @@ -3748,7 +3747,7 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>        _bfd_error_handler
>>         (_("error: %pB: unsupported XLEN (%u), you might be "
>>            "using wrong emulation"), ibfd, xlen_in);
>> -      return NULL;
>> +      goto cleanup;
>>      }
>>
>>    /* Free the previous merged_arch_str which called xmalloc.  */
>> @@ -3756,13 +3755,15 @@ riscv_merge_arch_attr_info (bfd *ibfd, char
>> *in_arch, char *out_arch,
>>
>>    merged_arch_str = riscv_arch_str (arch_size, &merged_subsets,
>>                                     false/* update */);
>> +  result = merged_arch_str;
>>
>> + cleanup:
>>    /* Release the subset lists.  */
>>    riscv_release_subset_list (&in_subsets);
>>    riscv_release_subset_list (&out_subsets);
>>    riscv_release_subset_list (&merged_subsets);
>>
>> -  return merged_arch_str;
>> +  return result;
>>  }
>>
>>  /* Merge object attributes from IBFD into output_bfd of INFO.
>> --
>> 2.54.0
>>
>>
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