libfs: fix error cast of negative value in simple_attr_write()
The attr->set() receive a value of u64, but simple_strtoll() is used for doing the conversion. It will lead to the error cast if user inputs a negative value. Use kstrtoull() instead of simple_strtoll() to convert a string got from the user to an unsigned value. The former will return '-EINVAL' if it gets a negetive value, but the latter can't handle the situation correctly. Make 'val' unsigned long long as what kstrtoull() takes, this will eliminate the compile warning on no 64-bit architectures. Fixes: f7b88631 ("fs/libfs.c: fix simple_attr_write() on 32bit machines") Signed-off-by:Yicong Yang <yangyicong@hisilicon.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Link: https://lkml.kernel.org/r/1605341356-11872-1-git-send-email-yangyicong@hisilicon.com Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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