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Fix a bunch of issues (and a few non-issues but appeasement is easier

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than arguing) Coverity found:

o Use open + fstat rather than stat + open to avoid any races for a
  file that's static for the life of the system. This will prevent any
  problems should someone insert a new device while installing a
  kernel in the future.
o Use strlcpy instead of strcpy as a failsafe to knowing that the
  strings can't possibly be larger than the buffer due to data
  source limits (though in the future these limits might be more
  dynamic).
o If we can't find the hints file, return rather than dereference
  a NULL pointer.
o Check for lastmod before calling strcmp in case a PNP entry
  comes before a module entry. That's not allowed, but within the
  realm of crazy things programmers do.
o Free lastmod before exiting search_hints() to avoid a leak.

CID: 1383971, 1383970, 1383969, 1383965, 1383963, 1383960
This commit is contained in:
Warner Losh 2017-12-27 18:30:24 +00:00
parent 858f246615
commit 3888260471
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327241
1 changed files with 14 additions and 8 deletions
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22
usr.sbin/devmatch/devmatch.c
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@ -31,6 +31,7 @@ __FBSDID("$FreeBSD$");
#include <ctype.h>
#include <devinfo.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
@ -78,14 +79,17 @@ read_linker_hints(void)
p = modpath;
while ((q = strsep(&p, ";")) != NULL) {
snprintf(fn, sizeof(fn), "%s/linker.hints", q);
if (stat(fn, &sb) != 0)
continue;
fd = open(fn, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
continue;
err(1, "Can't open %s for reading", fn);
}
if (fstat(fd, &sb) != 0)
err(1, "Can't fstat %s\n", fn);
hints = malloc(sb.st_size);
if (hints == NULL)
err(1, "not enough space to read hints file of %ju bytes", (uintmax_t)sb.st_size);
fd = open(fn, O_RDONLY);
if (fd < 0)
err(1, "Can't open %s for reading", fn);
if (read(fd, hints, sb.st_size) != sb.st_size)
err(1, "Can't read in %ju bytes from %s", (uintmax_t)sb.st_size, fn);
close(fd);
@ -95,6 +99,7 @@ read_linker_hints(void)
warnx("Can't read linker hints file.");
free(hints);
hints = NULL;
return;
}
if (*(int *)(intptr_t)hints != LINKER_HINTS_VERSION) {
warnx("Linker hints version %d doesn't match expected %d.",
@ -144,12 +149,12 @@ pnpval_as_int(const char *val, const char *pnpinfo)
cp = strchr(val, ';');
key[0] = ' ';
if (cp == NULL)
strcpy(key + 1, val);
strlcpy(key + 1, val, sizeof(key) - 1);
else {
memcpy(key + 1, val, cp - val);
key[cp - val + 1] = '\0';
}
strcat(key, "=");
strlcat(key, "=", sizeof(key));
if (strncmp(key + 1, pnpinfo, strlen(key + 1)) == 0)
rv = strtol(pnpinfo + strlen(key + 1), NULL, 0);
else {
@ -241,7 +246,7 @@ search_hints(const char *bus, const char *dev, const char *pnpinfo)
printf("Module %s in %s\n", val1, val2);
break;
case MDT_PNP_INFO:
if (!dump_flag && !unbound_flag && strcmp(lastmod, "kernel") == 0)
if (!dump_flag && !unbound_flag && lastmod && strcmp(lastmod, "kernel") == 0)
break;
getstr(&ptr, val1);
getstr(&ptr, val2);
@ -343,6 +348,7 @@ search_hints(const char *bus, const char *dev, const char *pnpinfo)
printf(" -------------------------");
printf("\n");
}
free(lastmod);
}
static int