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Subject[04/13] x86_64 memleak from malicious 32bit elf program
-stable review patch.  If anyone has any objections, please let us know.

------------------

malicious 32bit app can have an elf section at 0xffffe000. During
exec of this app, we will have a memory leak as insert_vm_struct() is
not checking for return value in syscall32_setup_pages() and thus not
freeing the vma allocated for the vsyscall page.

Check the return value and free the vma incase of failure.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86_64/ia32/syscall32.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletion(-)

--- linux-2.6.12.3.orig/arch/x86_64/ia32/syscall32.c 2005-07-28 11:17:01.000000000 -0700
+++ linux-2.6.12.3/arch/x86_64/ia32/syscall32.c 2005-07-28 11:17:11.000000000 -0700
@@ -57,6 +57,7 @@
int npages = (VSYSCALL32_END - VSYSCALL32_BASE) >> PAGE_SHIFT;
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
+ int ret;

vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
if (!vma)
@@ -78,7 +79,11 @@
vma->vm_mm = mm;

down_write(&mm->mmap_sem);
- insert_vm_struct(mm, vma);
+ if ((ret = insert_vm_struct(mm, vma))) {
+ up_write(&mm->mmap_sem);
+ kmem_cache_free(vm_area_cachep, vma);
+ return ret;
+ }
mm->total_vm += npages;
up_write(&mm->mmap_sem);
return 0;
-
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