tree e6aefba9862580081aee2c8538676a4637d54d20
parent 111c1aa8cad4a0069dfe98fc093507b5b2cdfda7
author Linus Torvalds <torvalds@linux-foundation.org> 1626281149 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1630601221 -0700

mm: don't allow oversized kvmalloc() calls

'kvmalloc()' is a convenience function for people who want to do a
kmalloc() but fall back on vmalloc() if there aren't enough physically
contiguous pages, or if the allocation is larger than what kmalloc()
supports.

However, let's make sure it doesn't get _too_ easy to do crazy things
with it.  In particular, don't allow big allocations that could be due
to integer overflow or underflow.  So make sure the allocation size fits
in an 'int', to protect against trivial integer conversion issues.

Acked-by: Willy Tarreau <w@1wt.eu>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>