On Sat, Sep 16, 2023 at 05:24:04PM +0300, Dan Carpenter wrote: > On Sat, Sep 16, 2023 at 01:41:43AM +0200, Danilo Krummrich wrote: > > Hi Dan, > > > > On 9/15/23 14:59, Dan Carpenter wrote: > > > The u_memcpya() function is supposed to return error pointers on > > > error. Returning NULL will lead to an Oops. > > > > > > Fixes: 68132cc6d1bc ("nouveau/u_memcpya: use vmemdup_user") > > > Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org> > > > --- > > > drivers/gpu/drm/nouveau/nouveau_drv.h | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h > > > b/drivers/gpu/drm/nouveau/nouveau_drv.h > > > index 3666a7403e47..52a708a98915 100644 > > > --- a/drivers/gpu/drm/nouveau/nouveau_drv.h > > > +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h > > > @@ -193,7 +193,7 @@ u_memcpya(uint64_t user, unsigned int nmemb, unsigned > > > int size) > > > size_t bytes; > > > if (unlikely(check_mul_overflow(nmemb, size, &bytes))) > > > - return NULL; > > > + return ERR_PTR(-ENOMEM); > > > > I plan to replace this function with an upcoming vmemdup_array_user() > > helper, > > which returns -EOVERFLOW instead, hence mind using that? > > > > Unless you disagree, no need to resubmit the patch, I can change it > > before applying the patch. > > Generally, I would say that ENOMEM is the correct error code. I feel > like someone thinks EOVERFLOW means integer overflow and that's not > correct. I means like if you pass a number higher than INT_MAX to > kstroint().
The most common error code for integer overflows is EINVAL because the user passed invalid data. regards, dan carpenter