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Subject: bug#79808: Possible missing fclose() in tac_nonseekable (src/tac.c)
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Hello coreutils maintainers,
While reviewing the source code of GNU coreutils (tac.c), I noticed a small
resource management
issue in the function `tac_nonseekable()`:
After calling `copy_to_temp(&tmp_stream, &tmp_file, input_fd, file)`, the
function uses `tmp_stream`
in `tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied)` but never
calls `fclose(tmp_stream)` afterwards.
As a result, the FILE stream and its underlying file descriptor remain open
until process termination.
Although this does not cause user-visible problems for short-lived `tac`
executions, adding an explicit
`fclose(tmp_stream)` (and perhaps removing the temporary file) would
improve resource hygiene and
avoid potential descriptor exhaustion if the function were reused in a
long-running context.
Environment:
- Observed in current `src/tac.c` (line ~423 in GNU coreutils latest)
Suggested fix (simplified):
```c
bool ok = tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied);
fclose(tmp_stream);
unlink(tmp_file);
return ok;
Best regards,
CheckScope
--000000000000f142f006433a63b9
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Hello coreutils maintainers,<br><br>While reviewing the so=
urce code of GNU coreutils (tac.c), I noticed a small resource management=
=C2=A0<div>issue in the function `tac_nonseekable()`:<br><br>After calling =
`copy_to_temp(&tmp_stream, &tmp_file, input_fd, file)`, the functio=
n uses `tmp_stream`=C2=A0</div><div>in `tac_seekable(fileno(tmp_stream), tm=
p_file, bytes_copied)` but never calls `fclose(tmp_stream)` afterwards. =C2=
=A0<br>As a result, the FILE stream and its underlying file descriptor rema=
in open until process termination.<br><br>Although this does not cause user=
-visible problems for short-lived `tac` executions, adding an explicit=C2=
=A0</div><div>`fclose(tmp_stream)` (and perhaps removing the temporary file=
) would improve resource hygiene and=C2=A0</div><div>avoid potential descri=
ptor exhaustion if the function were reused in a long-running context.<br><=
br>Environment: =C2=A0<br>- Observed in current `src/tac.c` (line ~423 in G=
NU coreutils=C2=A0latest)<br><br>Suggested fix (simplified):<br>```c<br>boo=
l ok =3D tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied);<br>fclos=
e(tmp_stream);<br>unlink(tmp_file);<br>return ok;<br></div><div><br></div><=
div><br></div><div>=C2=A0 Best regards,<br></div><div>=C2=A0 CheckScope</di=
v></div>
--000000000000f142f006433a63b9--
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Subject: bug#79808: Possible missing fclose() in tac_nonseekable (src/tac.c)
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tag 79808 notabug
close 79808
stop
details below...
On 10/11/2025 09:45, Ray steven wrote:
> Hello coreutils maintainers,
>
> While reviewing the source code of GNU coreutils (tac.c), I noticed a small
> resource management
> issue in the function `tac_nonseekable()`:
>
> After calling `copy_to_temp(&tmp_stream, &tmp_file, input_fd, file)`, the
> function uses `tmp_stream`
> in `tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied)` but never
> calls `fclose(tmp_stream)` afterwards.
> As a result, the FILE stream and its underlying file descriptor remain open
> until process termination.
>
> Although this does not cause user-visible problems for short-lived `tac`
> executions, adding an explicit
> `fclose(tmp_stream)` (and perhaps removing the temporary file) would
> improve resource hygiene and
> avoid potential descriptor exhaustion if the function were reused in a
> long-running context.
>
> Environment:
> - Observed in current `src/tac.c` (line ~423 in GNU coreutils latest)
>
> Suggested fix (simplified):
> ```c
> bool ok = tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied);
> fclose(tmp_stream);
> unlink(tmp_file);
> return ok;
The temp-stream module manages a single global resource per process,
so this would be incorrect.
I verified that there is no leak with `tac - - - - -`.
thanks,
Padraig
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Subject: bug#79808: Possible missing fclose() in tac_nonseekable (src/tac.c)
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From: Ray steven <checkscope.hyzc@HIDDEN>
Date: Mon, 10 Nov 2025 20:53:43 +0800
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Thanks, Padraig =E2=80=94 understood.
While the current implementation works correctly, it might still be a good
idea to
explicitly close the file once it=E2=80=99s no longer in use.
thanks,
CheckScope
On Mon, Nov 10, 2025 at 7:26=E2=80=AFPM P=C3=A1draig Brady <P@HIDDEN=
m> wrote:
> tag 79808 notabug
> close 79808
> stop
>
> details below...
>
> On 10/11/2025 09:45, Ray steven wrote:
> > Hello coreutils maintainers,
> >
> > While reviewing the source code of GNU coreutils (tac.c), I noticed a
> small
> > resource management
> > issue in the function `tac_nonseekable()`:
> >
> > After calling `copy_to_temp(&tmp_stream, &tmp_file, input_fd, file)`, t=
he
> > function uses `tmp_stream`
> > in `tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied)` but never
> > calls `fclose(tmp_stream)` afterwards.
> > As a result, the FILE stream and its underlying file descriptor remain
> open
> > until process termination.
> >
> > Although this does not cause user-visible problems for short-lived `tac=
`
> > executions, adding an explicit
> > `fclose(tmp_stream)` (and perhaps removing the temporary file) would
> > improve resource hygiene and
> > avoid potential descriptor exhaustion if the function were reused in a
> > long-running context.
> >
> > Environment:
> > - Observed in current `src/tac.c` (line ~423 in GNU coreutils latest)
> >
> > Suggested fix (simplified):
> > ```c
> > bool ok =3D tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied);
> > fclose(tmp_stream);
> > unlink(tmp_file);
> > return ok;
>
> The temp-stream module manages a single global resource per process,
> so this would be incorrect.
> I verified that there is no leak with `tac - - - - -`.
>
> thanks,
> Padraig
>
--0000000000001dc08f06433d060e
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<div dir=3D"ltr">Thanks, Padraig =E2=80=94 understood. =C2=A0<br>While the =
current implementation works correctly,=C2=A0it might still be a good idea =
to=C2=A0<div>explicitly close the file once it=E2=80=99s no longer in use.<=
/div><div><br></div><div>thanks,</div><div>CheckScope</div></div><br><div c=
lass=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_=
attr">On Mon, Nov 10, 2025 at 7:26=E2=80=AFPM P=C3=A1draig Brady <<a hre=
f=3D"mailto:P@HIDDEN">P@HIDDEN</a>> wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">tag 79808 notabug<br>
close 79808<br>
stop<br>
<br>
details below...<br>
<br>
On 10/11/2025 09:45, Ray steven wrote:<br>
> Hello coreutils maintainers,<br>
> <br>
> While reviewing the source code of GNU coreutils (tac.c), I noticed a =
small<br>
> resource management<br>
> issue in the function `tac_nonseekable()`:<br>
> <br>
> After calling `copy_to_temp(&tmp_stream, &tmp_file, input_fd, =
file)`, the<br>
> function uses `tmp_stream`<br>
> in `tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied)` but neve=
r<br>
> calls `fclose(tmp_stream)` afterwards.<br>
> As a result, the FILE stream and its underlying file descriptor remain=
open<br>
> until process termination.<br>
> <br>
> Although this does not cause user-visible problems for short-lived `ta=
c`<br>
> executions, adding an explicit<br>
> `fclose(tmp_stream)` (and perhaps removing the temporary file) would<b=
r>
> improve resource hygiene and<br>
> avoid potential descriptor exhaustion if the function were reused in a=
<br>
> long-running context.<br>
> <br>
> Environment:<br>
> - Observed in current `src/tac.c` (line ~423 in GNU coreutils latest)<=
br>
> <br>
> Suggested fix (simplified):<br>
> ```c<br>
> bool ok =3D tac_seekable(fileno(tmp_stream), tmp_file, bytes_copied);<=
br>
> fclose(tmp_stream);<br>
> unlink(tmp_file);<br>
> return ok;<br>
<br>
The temp-stream module manages a single global resource per process,<br>
so this would be incorrect.<br>
I verified that there is no leak with `tac - - - - -`.<br>
<br>
thanks,<br>
Padraig<br>
</blockquote></div>
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On 2025-11-10 04:53, Ray steven wrote:
> it might still be a good
> idea to
> explicitly close the file once it=E2=80=99s no longer in use.
Generally speaking we don't bother with explicit deallocation of=20
resources if not needed to avoid resource exhaustion. Such deallocation=20
complicates maintenance and slows down execution a bit, and in practice=20
these disadvantages outweigh the advantages of deallocation.
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