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autofs/autofs-5.1.7-eliminate-some-more-alloca-usage.patch

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autofs-5.1.7 - eliminate some more alloca usage
From: Ian Kent <raven@themaw.net>
Quite a bit of the alloca(3) usage has been eliminated over time.
Use malloc(3) for some more cases that might need to allocate a largish
amount of storage.
Signed-off-by: Ian Kent <raven@themaw.net>
---
autofs-5.1.7 - eliminate some more alloca usage
From: Ian Kent <raven@themaw.net>
Quite a bit of the alloca(3) usage has been eliminated over time.
Use malloc(3) for some more cases that might need to allocate a largish
amount of storage.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
modules/lookup_program.c | 11 ++++++++++-
modules/lookup_yp.c | 22 +++++++++++++++++++---
modules/parse_sun.c | 18 ++++++++++++++----
modules/replicated.c | 19 ++++++-------------
5 files changed, 50 insertions(+), 21 deletions(-)
--- autofs-5.1.7.orig/CHANGELOG
+++ autofs-5.1.7/CHANGELOG
@@ -78,6 +78,7 @@
- add missing description of null map option.
- fix nonstrict offset mount fail handling.
- fix concat_options() error handling.
+- eliminate some more alloca usage.
25/01/2021 autofs-5.1.7
- make bind mounts propagation slave by default.
--- autofs-5.1.7.orig/modules/lookup_program.c
+++ autofs-5.1.7/modules/lookup_program.c
@@ -636,7 +636,14 @@ int lookup_mount(struct autofs_point *ap
char *ent = NULL;
if (me->mapent) {
- ent = alloca(strlen(me->mapent) + 1);
+ ent = malloc(strlen(me->mapent) + 1);
+ if (!ent) {
+ char buf[MAX_ERR_BUF];
+ char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
+ error(ap->logopt, MODPREFIX "malloc: %s", estr);
+ cache_unlock(mc);
+ goto out_free;
+ }
strcpy(ent, me->mapent);
}
cache_unlock(mc);
@@ -644,6 +651,8 @@ int lookup_mount(struct autofs_point *ap
ap->entry->current = source;
ret = ctxt->parse->parse_mount(ap, name,
name_len, ent, ctxt->parse->context);
+ if (ent)
+ free(ent);
goto out_free;
} else {
if (IS_MM(me) && !IS_MM_ROOT(me)) {
--- autofs-5.1.7.orig/modules/lookup_yp.c
+++ autofs-5.1.7/modules/lookup_yp.c
@@ -254,7 +254,7 @@ int yp_all_master_callback(int status, c
len = ypkeylen + 1 + vallen + 2;
- buffer = alloca(len);
+ buffer = malloc(len);
if (!buffer) {
error(logopt, MODPREFIX "could not malloc parse buffer");
return 0;
@@ -267,6 +267,8 @@ int yp_all_master_callback(int status, c
master_parse_entry(buffer, timeout, logging, age);
+ free(buffer);
+
return 0;
}
@@ -368,7 +370,12 @@ int yp_all_callback(int status, char *yp
return 0;
}
- mapent = alloca(vallen + 1);
+ mapent = malloc(vallen + 1);
+ if (!mapent) {
+ error(logopt, MODPREFIX "could not malloc mapent buffer");
+ free(key);
+ return 0;
+ }
strncpy(mapent, val, vallen);
*(mapent + vallen) = '\0';
@@ -377,6 +384,7 @@ int yp_all_callback(int status, char *yp
cache_unlock(mc);
free(key);
+ free(mapent);
if (ret == CHE_FAIL)
return -1;
@@ -904,7 +912,14 @@ int lookup_mount(struct autofs_point *ap
}
if (me && (me->source == source || *me->key == '/')) {
mapent_len = strlen(me->mapent);
- mapent = alloca(mapent_len + 1);
+ mapent = malloc(mapent_len + 1);
+ if (!mapent) {
+ char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
+ error(ap->logopt, MODPREFIX "malloc: %s", estr);
+ cache_unlock(mc);
+ free(lkp_key);
+ return NSS_STATUS_TRYAGAIN;
+ }
strcpy(mapent, me->mapent);
}
}
@@ -929,6 +944,7 @@ int lookup_mount(struct autofs_point *ap
ret = ctxt->parse->parse_mount(ap, key, key_len,
mapent, ctxt->parse->context);
+ free(mapent);
if (ret) {
/* Don't update negative cache when re-connecting */
if (ap->flags & MOUNT_FLAG_REMOUNT)
--- autofs-5.1.7.orig/modules/parse_sun.c
+++ autofs-5.1.7/modules/parse_sun.c
@@ -668,9 +668,16 @@ static int sun_mount(struct autofs_point
}
}
+ what = malloc(loclen + 1);
+ if (!what) {
+ char buf[MAX_ERR_BUF];
+ char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
+ error(ap->logopt, MODPREFIX "malloc: %s", estr);
+ return 1;
+ }
+
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cur_state);
if (!strcmp(fstype, "nfs") || !strcmp(fstype, "nfs4")) {
- what = alloca(loclen + 1);
memcpy(what, loc, loclen);
what[loclen] = '\0';
@@ -706,10 +713,10 @@ static int sun_mount(struct autofs_point
rv = mount_nfs->mount_mount(ap, root, name, namelen,
what, fstype, options, mount_nfs->context);
} else {
- if (!loclen)
+ if (!loclen) {
+ free(what);
what = NULL;
- else {
- what = alloca(loclen + 1);
+ } else {
if (*loc == ':') {
loclen--;
memcpy(what, loc + 1, loclen);
@@ -728,6 +735,9 @@ static int sun_mount(struct autofs_point
/* Generic mount routine */
rv = do_mount(ap, root, name, namelen, what, fstype, options);
}
+ if (what)
+ free(what);
+
pthread_setcancelstate(cur_state, NULL);
if (nonstrict && rv)
--- autofs-5.1.7.orig/modules/replicated.c
+++ autofs-5.1.7/modules/replicated.c
@@ -1041,25 +1041,18 @@ done:
return ret;
}
-static int add_path(struct host *hosts, const char *path, int len)
+static int add_path(struct host *hosts, const char *path)
{
struct host *this;
- char *tmp, *tmp2;
-
- tmp = alloca(len + 1);
- if (!tmp)
- return 0;
-
- strncpy(tmp, path, len);
- tmp[len] = '\0';
+ char *tmp;
this = hosts;
while (this) {
if (!this->path) {
- tmp2 = strdup(tmp);
- if (!tmp2)
+ tmp = strdup(path);
+ if (!tmp)
return 0;
- this->path = tmp2;
+ this->path = tmp;
}
this = this->next;
}
@@ -1188,7 +1181,7 @@ int parse_location(unsigned logopt, stru
}
}
- if (!add_path(*hosts, path, strlen(path))) {
+ if (!add_path(*hosts, path)) {
free_host_list(hosts);
free(str);
return 0;
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