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Add checks for memory allocation failures in appropriate places, and 

avoid creating bad entries in the grp list as a result of memory allocation
failures while building new entries.

PR:		bin/83340
Reviewed by:	delphij (prior version of patch)
This commit is contained in:
Guy Helmer 2012-05-21 21:10:00 +00:00
parent 299bafae0c
commit fed7420ced
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=235740
1 changed files with 27 additions and 12 deletions
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39
lib/libc/gen/getnetgrent.c
View File

@ -203,9 +203,7 @@ setnetgrent(const char *group)
if (parse_netgrp(group))
endnetgrent();
else {
grouphead.grname = (char *)
malloc(strlen(group) + 1);
strcpy(grouphead.grname, group);
grouphead.grname = strdup(group);
}
if (netf)
fclose(netf);
@ -457,9 +455,9 @@ parse_netgrp(const char *group)
while (pos != NULL && *pos != '\0') {
if (*pos == '(') {
grp = (struct netgrp *)malloc(sizeof (struct netgrp));
if (grp == NULL)
return (1);
bzero((char *)grp, sizeof (struct netgrp));
grp->ng_next = grouphead.gr;
grouphead.gr = grp;
pos++;
gpos = strsep(&pos, ")");
#ifdef DEBUG
@ -480,6 +478,13 @@ parse_netgrp(const char *group)
if (len > 0) {
grp->ng_str[strpos] = (char *)
malloc(len + 1);
if (grp->ng_str[strpos] == NULL) {
int freepos;
for (freepos = 0; freepos < strpos; freepos++)
free(grp->ng_str[freepos]);
free(grp);
return (1);
}
bcopy(spos, grp->ng_str[strpos],
len + 1);
}
@ -493,6 +498,8 @@ parse_netgrp(const char *group)
grp->ng_str[strpos] = NULL;
}
}
grp->ng_next = grouphead.gr;
grouphead.gr = grp;
#ifdef DEBUG
/*
* Note: on other platforms, malformed netgroup
@ -529,7 +536,7 @@ parse_netgrp(const char *group)
static struct linelist *
read_for_group(const char *group)
{
char *pos, *spos, *linep, *olinep;
char *pos, *spos, *linep;
int len, olen;
int cont;
struct linelist *lp;
@ -537,6 +544,7 @@ read_for_group(const char *group)
#ifdef YP
char *result;
int resultlen;
linep = NULL;
while (_netgr_yp_enabled || fgets(line, LINSIZ, netf) != NULL) {
if (_netgr_yp_enabled) {
@ -557,6 +565,7 @@ read_for_group(const char *group)
free(result);
}
#else
linep = NULL;
while (fgets(line, LINSIZ, netf) != NULL) {
#endif
pos = (char *)&line;
@ -579,8 +588,14 @@ read_for_group(const char *group)
pos++;
if (*pos != '\n' && *pos != '\0') {
lp = (struct linelist *)malloc(sizeof (*lp));
if (lp == NULL)
return (NULL);
lp->l_parsed = 0;
lp->l_groupname = (char *)malloc(len + 1);
if (lp->l_groupname == NULL) {
free(lp);
return (NULL);
}
bcopy(spos, lp->l_groupname, len);
*(lp->l_groupname + len) = '\0';
len = strlen(pos);
@ -598,15 +613,15 @@ read_for_group(const char *group)
} else
cont = 0;
if (len > 0) {
linep = (char *)malloc(olen + len + 1);
if (olen > 0) {
bcopy(olinep, linep, olen);
free(olinep);
linep = (char *)reallocf(linep, olen + len + 1);
if (linep == NULL) {
free(lp->l_groupname);
free(lp);
return (NULL);
}
bcopy(pos, linep + olen, len);
olen += len;
*(linep + olen) = '\0';
olinep = linep;
}
if (cont) {
if (fgets(line, LINSIZ, netf)) {
@ -637,5 +652,5 @@ read_for_group(const char *group)
*/
rewind(netf);
#endif
return ((struct linelist *)0);
return (NULL);
}