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Fix some resource leaks.

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Always free dev and fstyp before strduping new values to assign to
them. Free them at the end of the loop. This keeps them from leaking
for mal-formed /etc/fstab lines.

CID: 1007777, 1007778, 1007779
Sponsored by: Netflix
This commit is contained in:
Warner Losh 2018-01-23 18:01:17 +00:00
parent 25f0135c49
commit 1065f77afb
1 changed files with 7 additions and 2 deletions
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9
stand/common/boot.c
View file

@ -319,6 +319,8 @@ getrootmount(char *rootdev)
goto notfound;
/* loop reading lines from /etc/fstab What was that about sscanf again? */
fstyp = NULL;
dev = NULL;
while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) {
if ((lbuf[0] == 0) || (lbuf[0] == '#'))
continue;
@ -330,6 +332,7 @@ getrootmount(char *rootdev)
continue;
/* delimit and save */
*cp++ = 0;
free(dev);
dev = strdup(lbuf);
/* skip whitespace up to mountpoint */
@ -349,6 +352,7 @@ getrootmount(char *rootdev)
while ((*cp != 0) && !isspace(*cp))
cp++;
*cp = 0;
free(fstyp);
fstyp = strdup(ep);
/* skip whitespace up to mount options */
@ -365,8 +369,6 @@ getrootmount(char *rootdev)
options = strdup(ep);
/* Build the <fstype>:<device> and save it in vfs.root.mountfrom */
sprintf(lbuf, "%s:%s", fstyp, dev);
free(dev);
free(fstyp);
setenv("vfs.root.mountfrom", lbuf, 0);
/* Don't override vfs.root.mountfrom.options if it is already set */
@ -379,6 +381,8 @@ getrootmount(char *rootdev)
break;
}
close(fd);
free(dev);
free(fstyp);
notfound:
if (error) {
@ -390,6 +394,7 @@ notfound:
cp[strlen(cp) - 1] = '\0';
setenv("vfs.root.mountfrom", cp, 0);
error = 0;
free(cp);
}
}