Re: [Xen-devel] [PATCH v2 03/13] fuzz/x86_emulate: Clear errors after each iteration

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.09.17 at 16:26, <george.dunlap@xxxxxxxxxx> wrote:
> Once feof() returns true for a stream, it will continue to return true
> for that stream until clearerr() is called (or the stream is closed
> and re-opened).
> 
> In llvm-clang-fast-mode, the same file descriptor is used for each
> iteration of the loop, meaning that the "Input too large" check was
> broken -- feof() would return true even if the fread() hadn't hit the
> end of the file.  The result is that AFL generates testcases of
> arbitrary size.
> 
> Fix this by clearing the error after each iteration.
> 
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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