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Re: [Patch, Fortran] PR55469 - fix I/O memory leaks in case of failure and iostat= being present
- From: Tobias Burnus <burnus at net-b dot de>
- To: gcc patches <gcc-patches at gcc dot gnu dot org>, gfortran <fortran at gcc dot gnu dot org>, Jerry DeLisle <jvdelisle2 at gmail dot com>
- Date: Thu, 29 Nov 2012 12:38:19 +0100
- Subject: Re: [Patch, Fortran] PR55469 - fix I/O memory leaks in case of failure and iostat= being present
- References: <50B39C70.9010304@net-b.de>
Tobias Burnus wrote:
l_push_char allocates memory which is freed with free_line. However,
currently, the memory is not always freed when calling generate_error.
If one aborts, that's fine. However, generate_error can also set the
iostat variable.
Updated version: Corrected PR number - and ensured that if convert_real
fails, free_saved is called (cf. additional test case in the PR).
Build and regtested on x86-64-gnu-linux.
OK for the trunk?
Tobias
2012-11-29 Tobias Burnus <burnus@net-b.de>
PR fortran/55469
* io/list_read (parse_repeat, read_integer, read_character,
parse_real, read_real, check_type, list_formatted_read_scalar,
finish_list_read): Call list_free.
diff --git a/libgfortran/io/list_read.c b/libgfortran/io/list_read.c
index 403e719..5063c36 100644
--- a/libgfortran/io/list_read.c
+++ b/libgfortran/io/list_read.c
@@ -617,6 +617,7 @@ parse_repeat (st_parameter_dt *dtp)
free_saved (dtp);
if (c == EOF)
{
+ free_line (dtp);
hit_eof (dtp);
return 1;
}
@@ -905,11 +906,14 @@ read_integer (st_parameter_dt *dtp, int length)
free_saved (dtp);
if (c == EOF)
{
+ free_line (dtp);
hit_eof (dtp);
return;
}
else if (c != '\n')
eat_line (dtp);
+
+ free_line (dtp);
snprintf (message, MSGLEN, "Bad integer for item %d in list input",
dtp->u.p.item_count);
generate_error (&dtp->common, LIBERROR_READ_VALUE, message);
@@ -1078,7 +1082,6 @@ read_character (st_parameter_dt *dtp, int length __attribute__ ((unused)))
unget_char (dtp, c);
eat_separator (dtp);
dtp->u.p.saved_type = BT_CHARACTER;
- free_line (dtp);
}
else
{
@@ -1087,10 +1090,12 @@ read_character (st_parameter_dt *dtp, int length __attribute__ ((unused)))
dtp->u.p.item_count);
generate_error (&dtp->common, LIBERROR_READ_VALUE, message);
}
+ free_line (dtp);
return;
eof:
free_saved (dtp);
+ free_line (dtp);
hit_eof (dtp);
}
@@ -1283,11 +1288,14 @@ parse_real (st_parameter_dt *dtp, void *buffer, int length)
free_saved (dtp);
if (c == EOF)
{
+ free_line (dtp);
hit_eof (dtp);
return 1;
}
else if (c != '\n')
eat_line (dtp);
+
+ free_line (dtp);
snprintf (message, MSGLEN, "Bad floating point number for item %d",
dtp->u.p.item_count);
generate_error (&dtp->common, LIBERROR_READ_VALUE, message);
@@ -1387,11 +1395,14 @@ eol_4:
free_saved (dtp);
if (c == EOF)
{
+ free_line (dtp);
hit_eof (dtp);
return;
}
else if (c != '\n')
eat_line (dtp);
+
+ free_line (dtp);
snprintf (message, MSGLEN, "Bad complex value in item %d of list input",
dtp->u.p.item_count);
generate_error (&dtp->common, LIBERROR_READ_VALUE, message);
@@ -1624,7 +1635,10 @@ read_real (st_parameter_dt *dtp, void * dest, int length)
eat_separator (dtp);
push_char (dtp, '\0');
if (convert_real (dtp, dest, dtp->u.p.saved_string, length))
- return;
+ {
+ free_saved (dtp);
+ return;
+ }
free_saved (dtp);
dtp->u.p.saved_type = BT_REAL;
@@ -1762,12 +1776,14 @@ read_real (st_parameter_dt *dtp, void * dest, int length)
free_saved (dtp);
if (c == EOF)
{
+ free_line (dtp);
hit_eof (dtp);
return;
}
else if (c != '\n')
eat_line (dtp);
+ free_line (dtp);
snprintf (message, MSGLEN, "Bad real number in item %d of list input",
dtp->u.p.item_count);
generate_error (&dtp->common, LIBERROR_READ_VALUE, message);
@@ -1784,6 +1800,7 @@ check_type (st_parameter_dt *dtp, bt type, int len)
if (dtp->u.p.saved_type != BT_UNKNOWN && dtp->u.p.saved_type != type)
{
+ free_line (dtp);
snprintf (message, MSGLEN, "Read type %s where %s was expected for item %d",
type_name (dtp->u.p.saved_type), type_name (type),
dtp->u.p.item_count);
@@ -1797,6 +1814,7 @@ check_type (st_parameter_dt *dtp, bt type, int len)
if (dtp->u.p.saved_length != len)
{
+ free_line (dtp);
snprintf (message, MSGLEN,
"Read kind %d %s where kind %d is required for item %d",
dtp->u.p.saved_length, type_name (dtp->u.p.saved_type), len,
@@ -1970,7 +1988,10 @@ list_formatted_read_scalar (st_parameter_dt *dtp, bt type, void *p,
cleanup:
if (err == LIBERROR_END)
- hit_eof (dtp);
+ {
+ free_line (dtp);
+ hit_eof (dtp);
+ }
return err;
}
@@ -2018,7 +2039,10 @@ finish_list_read (st_parameter_dt *dtp)
err = eat_line (dtp);
if (err == LIBERROR_END)
- hit_eof (dtp);
+ {
+ free_line (dtp);
+ hit_eof (dtp);
+ }
}
/* NAMELIST INPUT