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authorJeff Law <law@redhat.com>2012-11-29 10:45:34 -0700
committerJeff Law <law@redhat.com>2012-11-29 10:46:19 -0700
commit2af1b3285313519cc884fb86fdf61cbc77f92ea1 (patch)
tree9c203b149f2518533a7332f8778271bf16212c9f /nscd
parent111db5b197b27d87c6db903a132d288949984d51 (diff)
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[BZ #13761]
* nscd/grpcache.c (cache_addgr): Rename alloca_used to dataset_temporary. Track alloca usage into alloca_used. If dataset is large allocate and release it via malloc/free.
Diffstat (limited to 'nscd')
-rw-r--r--nscd/grpcache.c33
1 files changed, 25 insertions, 8 deletions
diff --git a/nscd/grpcache.c b/nscd/grpcache.c
index d09badf..f0dad4d 100644
--- a/nscd/grpcache.c
+++ b/nscd/grpcache.c
@@ -177,7 +177,8 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
char *cp;
const size_t key_len = strlen (key);
const size_t buf_len = 3 * sizeof (grp->gr_gid) + key_len + 1;
- char *buf = alloca (buf_len);
+ size_t alloca_used = 0;
+ char *buf = alloca_account (buf_len, alloca_used);
ssize_t n;
size_t cnt;
@@ -189,7 +190,7 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
/* Determine the length of all members. */
while (grp->gr_mem[gr_mem_cnt])
++gr_mem_cnt;
- gr_mem_len = (uint32_t *) alloca (gr_mem_cnt * sizeof (uint32_t));
+ gr_mem_len = alloca_account (gr_mem_cnt * sizeof (uint32_t), alloca_used);
for (gr_mem_cnt = 0; grp->gr_mem[gr_mem_cnt]; ++gr_mem_cnt)
{
gr_mem_len[gr_mem_cnt] = strlen (grp->gr_mem[gr_mem_cnt]) + 1;
@@ -204,7 +205,8 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
change. Allocate memory on the cache since it is likely
discarded anyway. If it turns out to be necessary to have a
new record we can still allocate real memory. */
- bool alloca_used = false;
+ bool dataset_temporary = false;
+ bool dataset_malloced = false;
dataset = NULL;
if (he == NULL)
@@ -215,10 +217,20 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
/* We cannot permanently add the result in the moment. But
we can provide the result as is. Store the data in some
temporary memory. */
- dataset = (struct dataset *) alloca (total + n);
+ if (! __libc_use_alloca (alloca_used + total + n))
+ {
+ dataset = malloc (total + n);
+ /* Perhaps we should log a message that we were unable
+ to allocate memory for a large request. */
+ if (dataset == NULL)
+ goto out;
+ dataset_malloced = true;
+ }
+ else
+ dataset = alloca_account (total + n, alloca_used);
/* We cannot add this record to the permanent database. */
- alloca_used = true;
+ dataset_temporary = true;
}
dataset->head.allocsize = total + n;
@@ -272,6 +284,11 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
allocated on the stack and need not be freed. */
dh->timeout = dataset->head.timeout;
++dh->nreloads;
+
+ /* If the new record was allocated via malloc, then we must free
+ it here. */
+ if (dataset_malloced)
+ free (dataset);
}
else
{
@@ -287,7 +304,7 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
key_copy = (char *) newp + (key_copy - (char *) dataset);
dataset = memcpy (newp, dataset, total + n);
- alloca_used = false;
+ dataset_temporary = false;
}
/* Mark the old record as obsolete. */
@@ -302,7 +319,7 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
assert (fd != -1);
#ifdef HAVE_SENDFILE
- if (__builtin_expect (db->mmap_used, 1) && !alloca_used)
+ if (__builtin_expect (db->mmap_used, 1) && ! dataset_temporary)
{
assert (db->wr_fd != -1);
assert ((char *) &dataset->resp > (char *) db->data);
@@ -329,7 +346,7 @@ cache_addgr (struct database_dyn *db, int fd, request_header *req,
/* Add the record to the database. But only if it has not been
stored on the stack. */
- if (! alloca_used)
+ if (! dataset_temporary)
{
/* If necessary, we also propagate the data to disk. */
if (db->persistent)