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glibc/glibc-RHEL-16643-2.patch
Arjun Shankar b02eb10bf8 getaddrinfo: Fix occasionally empty result due to nscd cache order (RHEL-16643) 
Resolves: RHEL-16643
2024-01-08 14:49:32 +01:00

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commit bc0d18d873abf2cda6842ad8bb4df2a31dc0fbac
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Tue Aug 3 21:29:23 2021 +0530
gai_init: Avoid jumping from if condition to its else counterpart
Clean up another antipattern where code flows from an if condition to
its else counterpart with a goto.
Most of the change in this patch is whitespace-only; a `git diff -b`
ought to show the actual logic changes.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: DJ Delorie <dj@redhat.com>
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 3bf9a8bae16a5b02..1635a09837351068 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -1933,142 +1933,122 @@ gaiconf_init (void)
bool scopelist_nullbits = false;
FILE *fp = fopen (GAICONF_FNAME, "rce");
- if (fp != NULL)
+ if (fp == NULL)
+ goto no_file;
+
+ struct __stat64_t64 st;
+ if (__fstat64_time64 (fileno (fp), &st) != 0)
{
- struct __stat64_t64 st;
- if (__fstat64_time64 (fileno (fp), &st) != 0)
- {
- fclose (fp);
- goto no_file;
- }
+ fclose (fp);
+ goto no_file;
+ }
- char *line = NULL;
- size_t linelen = 0;
+ char *line = NULL;
+ size_t linelen = 0;
- __fsetlocking (fp, FSETLOCKING_BYCALLER);
+ __fsetlocking (fp, FSETLOCKING_BYCALLER);
- while (!feof_unlocked (fp))
- {
- ssize_t n = __getline (&line, &linelen, fp);
- if (n <= 0)
- break;
+ while (!feof_unlocked (fp))
+ {
+ ssize_t n = __getline (&line, &linelen, fp);
+ if (n <= 0)
+ break;
- /* Handle comments. No escaping possible so this is easy. */
- char *cp = strchr (line, '#');
- if (cp != NULL)
- *cp = '\0';
+ /* Handle comments. No escaping possible so this is easy. */
+ char *cp = strchr (line, '#');
+ if (cp != NULL)
+ *cp = '\0';
- cp = line;
- while (isspace (*cp))
- ++cp;
+ cp = line;
+ while (isspace (*cp))
+ ++cp;
- char *cmd = cp;
- while (*cp != '\0' && !isspace (*cp))
- ++cp;
- size_t cmdlen = cp - cmd;
+ char *cmd = cp;
+ while (*cp != '\0' && !isspace (*cp))
+ ++cp;
+ size_t cmdlen = cp - cmd;
- if (*cp != '\0')
- *cp++ = '\0';
- while (isspace (*cp))
- ++cp;
+ if (*cp != '\0')
+ *cp++ = '\0';
+ while (isspace (*cp))
+ ++cp;
- char *val1 = cp;
- while (*cp != '\0' && !isspace (*cp))
- ++cp;
- size_t val1len = cp - cmd;
+ char *val1 = cp;
+ while (*cp != '\0' && !isspace (*cp))
+ ++cp;
+ size_t val1len = cp - cmd;
- /* We always need at least two values. */
- if (val1len == 0)
- continue;
+ /* We always need at least two values. */
+ if (val1len == 0)
+ continue;
- if (*cp != '\0')
- *cp++ = '\0';
- while (isspace (*cp))
- ++cp;
+ if (*cp != '\0')
+ *cp++ = '\0';
+ while (isspace (*cp))
+ ++cp;
- char *val2 = cp;
- while (*cp != '\0' && !isspace (*cp))
- ++cp;
+ char *val2 = cp;
+ while (*cp != '\0' && !isspace (*cp))
+ ++cp;
- /* Ignore the rest of the line. */
- *cp = '\0';
+ /* Ignore the rest of the line. */
+ *cp = '\0';
- switch (cmdlen)
+ switch (cmdlen)
+ {
+ case 5:
+ if (strcmp (cmd, "label") == 0)
{
- case 5:
- if (strcmp (cmd, "label") == 0)
+ if (!add_prefixlist (&labellist, &nlabellist,
+ &labellist_nullbits, val1, val2, &cp))
{
- if (!add_prefixlist (&labellist, &nlabellist,
- &labellist_nullbits, val1, val2, &cp))
- {
- free (line);
- fclose (fp);
- goto no_file;
- }
+ free (line);
+ fclose (fp);
+ goto no_file;
}
- break;
+ }
+ break;
- case 6:
- if (strcmp (cmd, "reload") == 0)
- {
- gaiconf_reload_flag = strcmp (val1, "yes") == 0;
- if (gaiconf_reload_flag)
- gaiconf_reload_flag_ever_set = 1;
- }
- break;
+ case 6:
+ if (strcmp (cmd, "reload") == 0)
+ {
+ gaiconf_reload_flag = strcmp (val1, "yes") == 0;
+ if (gaiconf_reload_flag)
+ gaiconf_reload_flag_ever_set = 1;
+ }
+ break;
- case 7:
- if (strcmp (cmd, "scopev4") == 0)
+ case 7:
+ if (strcmp (cmd, "scopev4") == 0)
+ {
+ struct in6_addr prefix;
+ unsigned long int bits;
+ unsigned long int val;
+ char *endp;
+
+ bits = 32;
+ __set_errno (0);
+ cp = strchr (val1, '/');
+ if (cp != NULL)
+ *cp++ = '\0';
+ if (inet_pton (AF_INET6, val1, &prefix))
{
- struct in6_addr prefix;
- unsigned long int bits;
- unsigned long int val;
- char *endp;
-
- bits = 32;
- __set_errno (0);
- cp = strchr (val1, '/');
- if (cp != NULL)
- *cp++ = '\0';
- if (inet_pton (AF_INET6, val1, &prefix))
- {
- bits = 128;
- if (IN6_IS_ADDR_V4MAPPED (&prefix)
- && (cp == NULL
- || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
- || errno != ERANGE)
- && *endp == '\0'
- && bits >= 96
- && bits <= 128
- && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
- || errno != ERANGE)
- && *endp == '\0'
- && val <= INT_MAX)
- {
- if (!add_scopelist (&scopelist, &nscopelist,
- &scopelist_nullbits, &prefix,
- bits, val))
- {
- free (line);
- fclose (fp);
- goto no_file;
- }
- }
- }
- else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3])
- && (cp == NULL
- || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
- || errno != ERANGE)
- && *endp == '\0'
- && bits <= 32
- && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
- || errno != ERANGE)
- && *endp == '\0'
- && val <= INT_MAX)
+ bits = 128;
+ if (IN6_IS_ADDR_V4MAPPED (&prefix)
+ && (cp == NULL
+ || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
+ || errno != ERANGE)
+ && *endp == '\0'
+ && bits >= 96
+ && bits <= 128
+ && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
+ || errno != ERANGE)
+ && *endp == '\0'
+ && val <= INT_MAX)
{
if (!add_scopelist (&scopelist, &nscopelist,
&scopelist_nullbits, &prefix,
- bits + 96, val))
+ bits, val))
{
free (line);
fclose (fp);
@@ -2076,173 +2056,191 @@ gaiconf_init (void)
}
}
}
- break;
-
- case 10:
- if (strcmp (cmd, "precedence") == 0)
+ else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3])
+ && (cp == NULL
+ || (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
+ || errno != ERANGE)
+ && *endp == '\0'
+ && bits <= 32
+ && ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
+ || errno != ERANGE)
+ && *endp == '\0'
+ && val <= INT_MAX)
{
- if (!add_prefixlist (&precedencelist, &nprecedencelist,
- &precedencelist_nullbits, val1, val2,
- &cp))
+ if (!add_scopelist (&scopelist, &nscopelist,
+ &scopelist_nullbits, &prefix,
+ bits + 96, val))
{
free (line);
fclose (fp);
goto no_file;
}
}
- break;
- }
- }
-
- free (line);
-
- fclose (fp);
-
- /* Create the array for the labels. */
- struct prefixentry *new_labels;
- if (nlabellist > 0)
- {
- if (!labellist_nullbits)
- ++nlabellist;
- new_labels = malloc (nlabellist * sizeof (*new_labels));
- if (new_labels == NULL)
- goto no_file;
-
- int i = nlabellist;
- if (!labellist_nullbits)
- {
- --i;
- memset (&new_labels[i].prefix, '\0', sizeof (struct in6_addr));
- new_labels[i].bits = 0;
- new_labels[i].val = 1;
}
+ break;
- struct prefixlist *l = labellist;
- while (i-- > 0)
+ case 10:
+ if (strcmp (cmd, "precedence") == 0)
{
- new_labels[i] = l->entry;
- l = l->next;
+ if (!add_prefixlist (&precedencelist, &nprecedencelist,
+ &precedencelist_nullbits, val1, val2,
+ &cp))
+ {
+ free (line);
+ fclose (fp);
+ goto no_file;
+ }
}
- free_prefixlist (labellist);
- labellist = NULL;
-
- /* Sort the entries so that the most specific ones are at
- the beginning. */
- qsort (new_labels, nlabellist, sizeof (*new_labels), prefixcmp);
+ break;
}
- else
- new_labels = (struct prefixentry *) default_labels;
-
- struct prefixentry *new_precedence;
- if (nprecedencelist > 0)
- {
- if (!precedencelist_nullbits)
- ++nprecedencelist;
- new_precedence = malloc (nprecedencelist * sizeof (*new_precedence));
- if (new_precedence == NULL)
- {
- if (new_labels != default_labels)
- free (new_labels);
- goto no_file;
- }
+ }
- int i = nprecedencelist;
- if (!precedencelist_nullbits)
- {
- --i;
- memset (&new_precedence[i].prefix, '\0',
- sizeof (struct in6_addr));
- new_precedence[i].bits = 0;
- new_precedence[i].val = 40;
- }
+ free (line);
- struct prefixlist *l = precedencelist;
- while (i-- > 0)
- {
- new_precedence[i] = l->entry;
- l = l->next;
- }
- free_prefixlist (precedencelist);
- precedencelist = NULL;
+ fclose (fp);
- /* Sort the entries so that the most specific ones are at
- the beginning. */
- qsort (new_precedence, nprecedencelist, sizeof (*new_precedence),
- prefixcmp);
+ /* Create the array for the labels. */
+ struct prefixentry *new_labels;
+ if (nlabellist > 0)
+ {
+ if (!labellist_nullbits)
+ ++nlabellist;
+ new_labels = malloc (nlabellist * sizeof (*new_labels));
+ if (new_labels == NULL)
+ goto no_file;
+
+ int i = nlabellist;
+ if (!labellist_nullbits)
+ {
+ --i;
+ memset (&new_labels[i].prefix, '\0', sizeof (struct in6_addr));
+ new_labels[i].bits = 0;
+ new_labels[i].val = 1;
}
- else
- new_precedence = (struct prefixentry *) default_precedence;
- struct scopeentry *new_scopes;
- if (nscopelist > 0)
+ struct prefixlist *l = labellist;
+ while (i-- > 0)
{
- if (!scopelist_nullbits)
- ++nscopelist;
- new_scopes = malloc (nscopelist * sizeof (*new_scopes));
- if (new_scopes == NULL)
- {
- if (new_labels != default_labels)
- free (new_labels);
- if (new_precedence != default_precedence)
- free (new_precedence);
- goto no_file;
- }
-
- int i = nscopelist;
- if (!scopelist_nullbits)
- {
- --i;
- new_scopes[i].addr32 = 0;
- new_scopes[i].netmask = 0;
- new_scopes[i].scope = 14;
- }
+ new_labels[i] = l->entry;
+ l = l->next;
+ }
+ free_prefixlist (labellist);
+ labellist = NULL;
- struct scopelist *l = scopelist;
- while (i-- > 0)
- {
- new_scopes[i] = l->entry;
- l = l->next;
- }
- free_scopelist (scopelist);
+ /* Sort the entries so that the most specific ones are at
+ the beginning. */
+ qsort (new_labels, nlabellist, sizeof (*new_labels), prefixcmp);
+ }
+ else
+ new_labels = (struct prefixentry *) default_labels;
- /* Sort the entries so that the most specific ones are at
- the beginning. */
- qsort (new_scopes, nscopelist, sizeof (*new_scopes),
- scopecmp);
+ struct prefixentry *new_precedence;
+ if (nprecedencelist > 0)
+ {
+ if (!precedencelist_nullbits)
+ ++nprecedencelist;
+ new_precedence = malloc (nprecedencelist * sizeof (*new_precedence));
+ if (new_precedence == NULL)
+ {
+ if (new_labels != default_labels)
+ free (new_labels);
+ goto no_file;
}
- else
- new_scopes = (struct scopeentry *) default_scopes;
-
- /* Now we are ready to replace the values. */
- const struct prefixentry *old = labels;
- labels = new_labels;
- if (old != default_labels)
- free ((void *) old);
- old = precedence;
- precedence = new_precedence;
- if (old != default_precedence)
- free ((void *) old);
+ int i = nprecedencelist;
+ if (!precedencelist_nullbits)
+ {
+ --i;
+ memset (&new_precedence[i].prefix, '\0',
+ sizeof (struct in6_addr));
+ new_precedence[i].bits = 0;
+ new_precedence[i].val = 40;
+ }
- const struct scopeentry *oldscope = scopes;
- scopes = new_scopes;
- if (oldscope != default_scopes)
- free ((void *) oldscope);
+ struct prefixlist *l = precedencelist;
+ while (i-- > 0)
+ {
+ new_precedence[i] = l->entry;
+ l = l->next;
+ }
+ free_prefixlist (precedencelist);
+ precedencelist = NULL;
- save_gaiconf_mtime (&st);
+ /* Sort the entries so that the most specific ones are at
+ the beginning. */
+ qsort (new_precedence, nprecedencelist, sizeof (*new_precedence),
+ prefixcmp);
}
else
+ new_precedence = (struct prefixentry *) default_precedence;
+
+ struct scopeentry *new_scopes;
+ if (nscopelist > 0)
{
- no_file:
- free_prefixlist (labellist);
- free_prefixlist (precedencelist);
+ if (!scopelist_nullbits)
+ ++nscopelist;
+ new_scopes = malloc (nscopelist * sizeof (*new_scopes));
+ if (new_scopes == NULL)
+ {
+ if (new_labels != default_labels)
+ free (new_labels);
+ if (new_precedence != default_precedence)
+ free (new_precedence);
+ goto no_file;
+ }
+
+ int i = nscopelist;
+ if (!scopelist_nullbits)
+ {
+ --i;
+ new_scopes[i].addr32 = 0;
+ new_scopes[i].netmask = 0;
+ new_scopes[i].scope = 14;
+ }
+
+ struct scopelist *l = scopelist;
+ while (i-- > 0)
+ {
+ new_scopes[i] = l->entry;
+ l = l->next;
+ }
free_scopelist (scopelist);
- /* If we previously read the file but it is gone now, free the
- old data and use the builtin one. Leave the reload flag
- alone. */
- fini ();
+ /* Sort the entries so that the most specific ones are at
+ the beginning. */
+ qsort (new_scopes, nscopelist, sizeof (*new_scopes),
+ scopecmp);
}
+ else
+ new_scopes = (struct scopeentry *) default_scopes;
+
+ /* Now we are ready to replace the values. */
+ const struct prefixentry *old = labels;
+ labels = new_labels;
+ if (old != default_labels)
+ free ((void *) old);
+
+ old = precedence;
+ precedence = new_precedence;
+ if (old != default_precedence)
+ free ((void *) old);
+
+ const struct scopeentry *oldscope = scopes;
+ scopes = new_scopes;
+ if (oldscope != default_scopes)
+ free ((void *) oldscope);
+
+ save_gaiconf_mtime (&st);
+ return;
+
+no_file:
+ free_prefixlist (labellist);
+ free_prefixlist (precedencelist);
+ free_scopelist (scopelist);
+
+ /* If we previously read the file but it is gone now, free the old data and
+ use the builtin one. Leave the reload flag alone. */
+ fini ();
}
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