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Jul 11:00, Barry Song wrote: > From: Barry Song > > Overflow in this context is highly unlikely. However, allocations using > GFP_NOFAIL are guaranteed to succeed, so checking the return value is > unnecessary. One option to fix this is allowing memory allocation with > an overflowed size, but it seems pointless. Let's at least issue a > warning. Likely BUG_ON() seems better as anyway we can't fix it? > > Cc: Michal Hocko > Cc: Uladzislau Rezki (Sony) > Cc: Christoph Hellwig > Cc: Lorenzo Stoakes > Cc: Christoph Lameter > Cc: Pekka Enberg > Cc: David Rientjes > Cc: Joonsoo Kim > Cc: Vlastimil Babka > Cc: Roman Gushchin > Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> > Signed-off-by: Barry Song > --- > include/linux/slab.h | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/include/linux/slab.h b/include/linux/slab.h > index a332dd2fa6cd..c6aec311864f 100644 > --- a/include/linux/slab.h > +++ b/include/linux/slab.h > @@ -692,8 +692,10 @@ static inline __alloc_size(1, 2) void *kmalloc_array_noprof(size_t n, size_t siz > { > size_t bytes; > > - if (unlikely(check_mul_overflow(n, size, &bytes))) > + if (unlikely(check_mul_overflow(n, size, &bytes))) { > + WARN_ON(flags & __GFP_NOFAIL); Hi Barry: IMO, using __GFP_NOFAIL guarantees success if and only if the parameters are *correct*. Maybe we can add here to help callers to find the reason as in mm/page_alloc.c ``` if (gfp_mask & __GFP_NOFAIL) { /* * All existing users of the __GFP_NOFAIL are blockable, so warn * of any new users that actually require GFP_NOWAIT */ if (WARN_ON_ONCE_GFP(!can_direct_reclaim, gfp_mask)) goto fail; /* * PF_MEMALLOC request from this context is rather bizarre * because we cannot reclaim anything and only can loop waiting * for somebody to do a work for us */ WARN_ON_ONCE_GFP(current->flags & PF_MEMALLOC, gfp_mask); /* * non failing costly orders are a hard requirement which we * are not prepared for much so let's warn about these users * so that we can identify them and convert them to something * else. */ WARN_ON_ONCE_GFP(costly_order, gfp_mask); ``` > return NULL; > + } > if (__builtin_constant_p(n) && __builtin_constant_p(size)) > return kmalloc_noprof(bytes, flags); > return kmalloc_noprof(bytes, flags); > @@ -794,8 +796,10 @@ kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node) > { > size_t bytes; > > - if (unlikely(check_mul_overflow(n, size, &bytes))) > + if (unlikely(check_mul_overflow(n, size, &bytes))) { > + WARN_ON(flags & __GFP_NOFAIL); > return NULL; > + } > > return kvmalloc_node_noprof(bytes, flags, node); > } > -- > 2.34.1 > > -- help you, help me, Hailong.