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sysusers: make sure to reset the returned value when EOF is reached in fget*ent_sane() wrappers (#8737)

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To indicate that the there're no more entries, these wrappers return false but
did leave the passed pointed unmodified.

However EOF is not an error and is a very common case so initialize the output
argument to NULL even in this case so callers don't need to do that.

Fixes: #8721
This commit is contained in:
Franck Bui 2018-04-18 18:32:21 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 613bddf7d1
commit 80359410c4
6 changed files with 15 additions and 20 deletions
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28
src/basic/user-util.c
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@ -775,14 +775,11 @@ int fgetpwent_sane(FILE *stream, struct passwd **pw) {
errno = 0;
p = fgetpwent(stream);
if (p == NULL) {
if (errno == ENOENT)
return false;
if (p == NULL && errno != ENOENT)
return errno > 0 ? -errno : -EIO;
}
*pw = p;
return true;
return p != NULL;
}
int fgetspent_sane(FILE *stream, struct spwd **sp) {
@ -793,14 +790,11 @@ int fgetspent_sane(FILE *stream, struct spwd **sp) {
errno = 0;
s = fgetspent(stream);
if (s == NULL) {
if (errno == ENOENT)
return false;
if (s == NULL && errno != ENOENT)
return errno > 0 ? -errno : -EIO;
}
*sp = s;
return true;
return s != NULL;
}
int fgetgrent_sane(FILE *stream, struct group **gr) {
@ -811,14 +805,11 @@ int fgetgrent_sane(FILE *stream, struct group **gr) {
errno = 0;
g = fgetgrent(stream);
if (g == NULL) {
if (errno == ENOENT)
return false;
if (g == NULL && errno != ENOENT)
return errno > 0 ? -errno : -EIO;
}
*gr = g;
return true;
return g != NULL;
}
#if ENABLE_GSHADOW
@ -830,13 +821,10 @@ int fgetsgent_sane(FILE *stream, struct sgrp **sg) {
errno = 0;
s = fgetsgent(stream);
if (s == NULL) {
if (errno == ENOENT)
return false;
if (s == NULL && errno != ENOENT)
return errno > 0 ? -errno : -EIO;
}
*sg = s;
return true;
return s != NULL;
}
#endif

2
test/TEST-21-SYSUSERS/test-12.expected-group Normal file
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@ -0,0 +1,2 @@
root:x:0:
systemd-coredump:x:1:

2
test/TEST-21-SYSUSERS/test-12.expected-passwd Normal file
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@ -0,0 +1,2 @@
root:x:0:0:root:/root:/bin/bash
systemd-coredump:x:1:1:systemd Core Dumper:/:/sbin/nologin

1
test/TEST-21-SYSUSERS/test-12.initial-group Normal file
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@ -0,0 +1 @@
root:x:0:

1
test/TEST-21-SYSUSERS/test-12.initial-passwd Normal file
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@ -0,0 +1 @@
root:x:0:0:root:/root:/bin/bash

1
test/TEST-21-SYSUSERS/test-12.input Normal file
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@ -0,0 +1 @@
u systemd-coredump 1 "systemd Core Dumper"