fix mm/util.c:krealloc()

Commit ef8b4520bd9f8294ffce9abd6158085bde5dc902 added one NULL check for
"p" in krealloc(), but that doesn't seem to be enough since there
doesn't seem to be any guarantee that memcpy(ret, NULL, 0) works
(spotted by the Coverity checker).

For making it clearer what happens this patch also removes the pointless
min().

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/util.c b/mm/util.c
index 5f64026cbb4d0f6c053a539ffb0d723255da85f3..8f18683825bcd0e3b95b4fe1754befb3e0b0268c 100644 (file)
--- a/mm/util.c
+++ b/mm/util.c
@@ -95,8 +95,8 @@ void *krealloc(const void *p, size_t new_size, gfp_t flags)
                return (void *)p;
 
        ret = kmalloc_track_caller(new_size, flags);
-       if (ret) {
-               memcpy(ret, p, min(new_size, ks));
+       if (ret && p) {
+               memcpy(ret, p, ks);
                kfree(p);
        }
        return ret;