The refactoring to not build a new vmalloc region only actually worked when shrinking. Actually return the resized area when it grows. Ugh. Reported-by: Shung-Hsi Yu <shung-hsi.yu@xxxxxxxx> Closes: https://lore.kernel.org/all/20250515-bpf-verifier-slowdown-vwo2meju4cgp2su5ckj@6gi6ssxbnfqg Tested-by: Eduard Zingerman <eddyz87@xxxxxxxxx> Tested-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx> Fixes: a0309faf1cb0 ("mm: vmalloc: support more granular vrealloc() sizing") Signed-off-by: Kees Cook <kees@xxxxxxxxxx> --- Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Uladzislau Rezki <urezki@xxxxxxxxx> Cc: <linux-mm@xxxxxxxxx> --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 2d7511654831..74bd00fd734d 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4111,6 +4111,7 @@ void *vrealloc_noprof(const void *p, size_t size, gfp_t flags) if (want_init_on_alloc(flags)) memset((void *)p + old_size, 0, size - old_size); vm->requested_size = size; + return (void *)p; } /* TODO: Grow the vm_area, i.e. allocate and map additional pages. */ -- 2.34.1
