[PATCH v2] tee: shm: don't warn on oversized request in tee_dyn_shm_alloc_helper()

[Georgiy Osokin]

tee_dyn_shm_alloc_helper() passes the size from TEE_IOC_SHM_ALLOC to
alloc_pages_exact(), which needs one physically contiguous block. A size
above 4 MiB (MAX_PAGE_ORDER with 4 KiB pages) is more than the page
allocator can serve, so it trips its order warning; on a panic_on_warn
kernel that is a panic.

The size comes from userspace and the request fails with -ENOMEM anyway,
so pass __GFP_NOWARN.

Fixes: abd135ba215c ("tee: optee: add optee-specific shared pool implementation")
Cc: stable@xxxxxxxxxxxxxxx
Cc: lvc-project@xxxxxxxxxxxxxxxx
Signed-off-by: Georgiy Osokin <g.osokin@xxxxxxxxxxxx>
---
v2: Fixes now points to abd135ba215c, the commit that introduced the
    unchecked allocation; cf4441503e20 only moved the code.
v1: https://lore.kernel.org/all/20261026105209.161195-1-g.osokin@xxxxxxxxxxxx/

 drivers/tee/tee_shm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index daa4af1..8b117d6 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -352,7 +352,7 @@ int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align,
 	 * and there's no need for any larger alignment.
 	 */
 	shm->kaddr = alloc_pages_exact(nr_pages * PAGE_SIZE,
-				       GFP_KERNEL | __GFP_ZERO);
+				       GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN);
 	if (!shm->kaddr)
 		return -ENOMEM;

-- 
2.54.0