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* nscd/mem.c (gc): Avoid stack overflow when allocating move list.

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This commit is contained in:
Ulrich Drepper 2008-05-18 06:29:10 +00:00
parent fa526148d6
commit 5811d72b73
2 changed files with 18 additions and 2 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
2008-05-17 Ulrich Drepper <drepper@redhat.com>
* nscd/mem.c (gc): Avoid stack overflow when allocating move list.
* nscd/mem.c (gc): Correctly determine highest used array element
in mark.

18
nscd/mem.c
View File

@ -24,6 +24,7 @@
#include <inttypes.h>
#include <libintl.h>
#include <limits.h>
#include <obstack.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@ -157,6 +158,7 @@ gc (struct database_dyn *db)
he = alloca (db->head->nentries * sizeof (struct hashentry *));
he_data = alloca (db->head->nentries * sizeof (struct hashentry *));
he_use_malloc = false;
stack_used += memory_needed;
}
else
{
@ -305,6 +307,10 @@ gc (struct database_dyn *db)
size_t size;
struct moveinfo *next;
} *moves = NULL;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
struct obstack ob;
obstack_init (&ob);
while (byte < high)
{
@ -365,8 +371,14 @@ gc (struct database_dyn *db)
displacement. */
ref_t disp = off_alloc - off_free;
struct moveinfo *new_move
= (struct moveinfo *) alloca (sizeof (*new_move));
struct moveinfo *new_move;
if (stack_used + sizeof (*new_move) <= MAX_STACK_USE)
{
new_move = alloca (sizeof (*new_move));
stack_used += sizeof (*new_move);
}
else
new_move = obstack_alloc (&ob, sizeof (*new_move));
new_move->from = db->data + off_alloc;
new_move->to = db->data + off_free;
new_move->size = off_allocend - off_alloc;
@ -526,6 +538,8 @@ gc (struct database_dyn *db)
free (he);
if (mark_use_malloc)
free (mark);
obstack_free (&ob, NULL);
}