diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2004-09-09 01:58:35 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-09-09 01:58:35 +0000 |
| commit | 9d0cdc0eeaf8b0ca19bf04c5e18b00d965fcd0a8 (patch) | |
| tree | e4f8023b9d5219537e107005002bc57cc33a6576 | |
| parent | 4924c0072b10d1e72662f02448b96cd6129c445b (diff) | |
| download | glibc-9d0cdc0eeaf8b0ca19bf04c5e18b00d965fcd0a8.tar.gz glibc-9d0cdc0eeaf8b0ca19bf04c5e18b00d965fcd0a8.tar.xz glibc-9d0cdc0eeaf8b0ca19bf04c5e18b00d965fcd0a8.zip | |
Update.
2004-09-08 Ulrich Drepper <drepper@redhat.com> * malloc/malloc.c (_int_free): Add inexpensive double free test.
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | malloc/malloc.c | 7 |
2 files changed, 11 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index a906d61b11..c0623993b3 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2004-09-08 Ulrich Drepper <drepper@redhat.com> + + * malloc/malloc.c (_int_free): Add inexpensive double free test. + 2004-09-08 Roland McGrath <roland@redhat.com> * malloc/mcheck.c: Don't use __P. diff --git a/malloc/malloc.c b/malloc/malloc.c index 5636d5cfb0..4db40514d6 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -4201,6 +4201,13 @@ _int_free(mstate av, Void_t* mem) set_fastchunks(av); fb = &(av->fastbins[fastbin_index(size)]); + /* Another simple check: make sure the top of the bin is not the + record we are going to add (i.e., double free). */ + if (__builtin_expect (*fb == p, 0)) + { + malloc_printf_nc (check_action, "double free(%p)!\n", mem); + return; + } p->fd = *fb; *fb = p; } |