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authorVolker Lendecke <vl@samba.org>2013-05-30 14:52:59 +0200
committerVolker Lendecke <vl@samba.org>2013-06-03 10:21:20 +0200
commit4483bf143ddfee9ec07aed8f124559b00f757d9a (patch)
tree45f4a34ac35fefca010248428f30c0d1bfa27c75 /lib
parent42b0b275059f9c98b9bf417f2048fdc973449def (diff)
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tdb: Add overflow-checking tdb_add_off_t
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'lib')
-rw-r--r--lib/tdb/common/tdb.c11
-rw-r--r--lib/tdb/common/tdb_private.h1
2 files changed, 12 insertions, 0 deletions
diff --git a/lib/tdb/common/tdb.c b/lib/tdb/common/tdb.c
index a2ae187f57..6256a05d04 100644
--- a/lib/tdb/common/tdb.c
+++ b/lib/tdb/common/tdb.c
@@ -1000,6 +1000,17 @@ bool tdb_write_all(int fd, const void *buf, size_t count)
return true;
}
+bool tdb_add_off_t(tdb_off_t a, tdb_off_t b, tdb_off_t *pret)
+{
+ tdb_off_t ret = a + b;
+
+ if ((ret < a) || (ret < b)) {
+ return false;
+ }
+ *pret = ret;
+ return true;
+}
+
#ifdef TDB_TRACE
static void tdb_trace_write(struct tdb_context *tdb, const char *str)
{
diff --git a/lib/tdb/common/tdb_private.h b/lib/tdb/common/tdb_private.h
index 406fc5f7f2..c37246f150 100644
--- a/lib/tdb/common/tdb_private.h
+++ b/lib/tdb/common/tdb_private.h
@@ -282,4 +282,5 @@ void tdb_header_hash(struct tdb_context *tdb,
uint32_t *magic1_hash, uint32_t *magic2_hash);
unsigned int tdb_old_hash(TDB_DATA *key);
size_t tdb_dead_space(struct tdb_context *tdb, tdb_off_t off);
+bool tdb_add_off_t(tdb_off_t a, tdb_off_t b, tdb_off_t *pret);
#endif /* TDB_PRIVATE_H */