Messages in this thread | | | Date | Tue, 01 Jan 2019 09:51:53 +0100 | From | Takashi Iwai <> | Subject | Re: [PATCH] sound:emu10k1:Use kmemdup instead of duplicating its function |
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On Mon, 24 Dec 2018 09:42:48 +0100, huang.zijiang wrote: > > From: "huang.zijiang" <huang.zijiang@zte.com.cn> > > kmemdup has implemented the function that kmalloc() and memcpy(). > > Signed-off-by: huang.zijiang <huang.zijiang@zte.com.cn> > --- > sound/pci/emu10k1/emufx.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c > index 6ebe817..b4fe4c5 100644 > --- a/sound/pci/emu10k1/emufx.c > +++ b/sound/pci/emu10k1/emufx.c > @@ -671,10 +671,9 @@ static unsigned int *copy_tlv(const unsigned int __user *_tlv, bool in_kernel) > return NULL; > if (data[1] >= MAX_TLV_SIZE) > return NULL; > - tlv = kmalloc(data[1] + sizeof(data), GFP_KERNEL); > + tlv = kmemdup(data, data[1] + sizeof(data), GFP_KERNEL); > if (!tlv) > return NULL; > - memcpy(tlv, data, sizeof(data));
These changes are not equivalent, and rather dangerous, unfortunately. The memcpy() performs only for sizeof(data), and in this case, it's not the same size as the allocation above.
thanks,
Takashi
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