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Parse integers more carefully, cont'd.

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* qemud/qemud.c: Replace uses of strtol with uses of xstrtol_i.
  Avoid overflow for very large --timeout=N values.
* src/nodeinfo.c: In linuxNodeInfoMemPopulate and
  linuxNodeInfoCPUPopulate, use xstrtol_i rather than strtol.
  Unlike in qemud.c, here we allow trailing "isspace", and in
  the case of "cpuinfo cpu MHz", also allow a "." terminator,
  since we ignore the decimal and any following digits.
* src/internal.h: Define xstrtol_ui, too.


Author: Jim Meyering <meyering@redhat.com>
This commit is contained in:
Jim Meyering 2007-11-14 10:53:05 +00:00
parent 5a6571eba9
commit 5d25419188
4 changed files with 58 additions and 19 deletions
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10
ChangeLog
View File

@ -1,5 +1,15 @@
Wed Nov 14 11:34:35 CET 2007 Jim Meyering <meyering@redhat.com>
Parse integers more carefully, cont'd.
* qemud/qemud.c: Replace uses of strtol with uses of xstrtol_i.
Avoid overflow for very large --timeout=N values.
* src/nodeinfo.c: In linuxNodeInfoMemPopulate and
linuxNodeInfoCPUPopulate, use xstrtol_i rather than strtol.
Unlike in qemud.c, here we allow trailing "isspace", and in
the case of "cpuinfo cpu MHz", also allow a "." terminator,
since we ignore the decimal and any following digits.
* src/internal.h: Define xstrtol_ui, too.
Arrange for tests to pass in a non-srcdir build.
* tests/Makefile.am: Include the contents of the *data directories
in the make-dist-built tarball by adding each of that *data

16
qemud/qemud.c
View File

@ -1583,9 +1583,7 @@ remoteReadConfigFile (const char *filename)
p = virConfGetValue (conf, "unix_sock_ro_perms");
CHECK_TYPE ("unix_sock_ro_perms", VIR_CONF_STRING);
if (p && p->str) {
char *tmp = NULL;
unix_sock_ro_perms = strtol(p->str, &tmp, 8);
if (*tmp) {
if (xstrtol_i(p->str, NULL, 8, &unix_sock_ro_perms) != 0) {
qemudLog (QEMUD_ERR, "Failed to parse mode '%s'", p->str);
return -1;
}
@ -1594,9 +1592,7 @@ remoteReadConfigFile (const char *filename)
p = virConfGetValue (conf, "unix_sock_rw_perms");
CHECK_TYPE ("unix_sock_rw_perms", VIR_CONF_STRING);
if (p && p->str) {
char *tmp = NULL;
unix_sock_rw_perms = strtol(p->str, &tmp, 8);
if (*tmp) {
if (xstrtol_i(p->str, NULL, 8, &unix_sock_rw_perms) != 0) {
qemudLog (QEMUD_ERR, "Failed to parse mode '%s'", p->str);
return -1;
}
@ -1797,10 +1793,10 @@ int main(int argc, char **argv) {
break;
case 't':
timeout = strtol(optarg, &tmp, 10);
if (!tmp)
timeout = -1;
if (timeout <= 0)
if (xstrtol_i(optarg, &tmp, 10, &timeout) != 0
|| timeout <= 0
/* Ensure that we can multiply by 1000 without overflowing. */
|| timeout > INT_MAX / 1000)
timeout = -1;
break;

19
src/internal.h
View File

@ -264,6 +264,25 @@ xstrtol_i(char const *s, char **end_ptr, int base, int *result)
return 0;
}
/* Just like xstrtol_i, above, but produce an "unsigned int" value. */
static inline int
xstrtol_ui(char const *s, char **end_ptr, int base, unsigned int *result)
{
unsigned long int val;
char *p;
int err;
errno = 0;
val = strtoul(s, &p, base);
err = (errno || (!end_ptr && *p) || p == s || (unsigned int) val != val);
if (end_ptr)
*end_ptr = p;
if (err)
return -1;
*result = val;
return 0;
}
#ifdef __cplusplus
}
#endif /* __cplusplus */

24
src/nodeinfo.c
View File

@ -63,6 +63,8 @@ int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo, virNodeInfoPtr n
}
nodeinfo->cpus++;
} else if (STREQLEN(buf, "cpu MHz", 7)) {
char *p;
unsigned int ui;
buf += 9;
while (*buf && isspace(*buf))
buf++;
@ -72,8 +74,12 @@ int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo, virNodeInfoPtr n
"parsing cpuinfo cpu MHz");
return -1;
}
nodeinfo->mhz = (unsigned int)strtol(buf+1, NULL, 10);
if (xstrtol_ui(buf+1, &p, 10, &ui) == 0
/* Accept trailing fractional part. */
&& (*p == '\0' || *p == '.' || isspace(*p)))
nodeinfo->mhz = ui;
} else if (STREQLEN(buf, "cpu cores", 9)) { /* aka cores */
char *p;
unsigned int id;
buf += 9;
while (*buf && isspace(*buf))
@ -84,8 +90,9 @@ int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo, virNodeInfoPtr n
"parsing cpuinfo cpu cores %c", *buf);
return -1;
}
id = (unsigned int)strtol(buf+1, NULL, 10);
if (id > nodeinfo->cores)
if (xstrtol_ui(buf+1, &p, 10, &id) == 0
&& (*p == '\0' || isspace(*p))
&& id > nodeinfo->cores)
nodeinfo->cores = id;
}
}
@ -108,14 +115,21 @@ int linuxNodeInfoCPUPopulate(virConnectPtr conn, FILE *cpuinfo, virNodeInfoPtr n
}
int linuxNodeInfoMemPopulate(virConnectPtr conn, FILE *meminfo, virNodeInfoPtr nodeinfo) {
int linuxNodeInfoMemPopulate(virConnectPtr conn, FILE *meminfo,
virNodeInfoPtr nodeinfo) {
char line[1024];
nodeinfo->memory = 0;
while (fgets(line, sizeof(line), meminfo) != NULL) {
if (STREQLEN(line, "MemTotal:", 9)) {
nodeinfo->memory = (unsigned int)strtol(line + 10, NULL, 10);
char *p;
unsigned int ui;
if (xstrtol_ui(line + 10, &p, 10, &ui) == 0
&& (*p == '\0' || isspace(*p))) {
nodeinfo->memory = ui;
break;
}
}
}
if (!nodeinfo->memory) {