At Mon, 22 Mar 2010 08:43:47 -0700,
Joe Perches wrote:
>
> On Mon, 2010-03-22 at 18:39 +0300, Dan Carpenter wrote:
> > card->driver is 15 characters and a NULL, the original code could
> > cause a buffer overflow.
>
> > In version 2, I used a better name that Takashi Iwai suggested.
>
> Perhaps it's better to use strncpy as well.
strlcpy() would be safer :)
But, in such a case, we want rather that the error is notified at
build time.
Maybe a macro like below would be helpful to catch such bugs?
#define COPY_STRING(buf, src) \
do { \
if (__builtin_constant_p(src)) \
BUILD_BUG_ON(strlen(src) >= sizeof(buf)); \
strcpy(buf, src); \
} while (0)
and used like:
struct foo {
char foo[5];
} x;
COPY_STRING(x.foo, "OK"); // OK
COPY_STRING(x.foo, "1234567890"); // NG
Takashi
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