On 20 April 2016 at 12:53:41, Guillermo Julián Moreno (guillermo.julian@xxxxxxxxx(mailto:guillermo.julian@xxxxxxxxx)) wrote: > > When remapping pages accounting for 4G or more memory space, the > operation 'count << PAGE_SHIFT' overflows as it is performed on an > integer. Solution: cast before doing the bitshift. > > Signed-off-by: Guillermo Julián > --- > mm/vmalloc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index ae7d20b..97257e4 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -1114,7 +1114,7 @@ EXPORT_SYMBOL(vm_unmap_ram); > */ > void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) > { > - unsigned long size = count << PAGE_SHIFT; > + unsigned long size = ((unsigned long) count) << PAGE_SHIFT; > unsigned long addr; > void *mem; > > @@ -1484,7 +1484,7 @@ static void __vunmap(const void *addr, int deallocate_pages) > kfree(area); > return; > } > - > + > /** > * vfree - release memory allocated by vmalloc() > * @addr: memory base address > -- > 1.8.3.1 Hello, has anyone taken a look at this patch? Guillermo Julián -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href