[PATCH] drm/lease: use kvcalloc instead of kcalloc to avoid warn triggering.

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

Attempt to use kvmalloc to avoid kmalloc warnings on larger allocations.

It might make sense to try and make a limit for the number of objects allowed here.

------------[ cut here ]------------
WARNING: CPU: 1 PID: 18929 at mm/page_alloc.c:4545 __alloc_pages+0x402/0x21b0 mm/page_alloc.c:4545
Modules linked in:
CPU: 1 PID: 18929 Comm: syz-executor.3 Not tainted 6.8.0 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:__alloc_pages+0x402/0x21b0 mm/page_alloc.c:4545
Code: ff 00 0f 84 15 fe ff ff 80 ce 01 e9 0d fe ff ff 83 fe 0a 0f 86 0e fd ff ff 80 3d c7 cf 6a 0d 00 75 0b c6 05 be cf 6a 0d 01 90 <0f> 0b 90 45 31 e4 e9 87 fe ff ff e8 5e 3e 9b ff 84 c0 0f 85 7a fe
RSP: 0018:ffffc90001cc7808 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff92000398f14
RDX: 0000000000000001 RSI: 000000000000000b RDI: 0000000000040dc0
RBP: ffffc90001cc7ab8 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000007a1200
R13: 000000000000000b R14: 0000000000040dc0 R15: 000000000000000b
FS:  00007f1717ba5640(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203d0000 CR3: 000000001f5c0000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 __kmalloc_large_node+0x88/0x1a0 mm/slub.c:3926
 __do_kmalloc_node mm/slub.c:3969 [inline]
 __kmalloc+0x370/0x480 mm/slub.c:3994
 kmalloc_array include/linux/slab.h:627 [inline]
 kcalloc include/linux/slab.h:658 [inline]
 fill_object_idr drivers/gpu/drm/drm_lease.c:389 [inline]
 drm_mode_create_lease_ioctl+0x4ca/0x1f70 drivers/gpu/drm/drm_lease.c:522
 drm_ioctl_kernel+0x1eb/0x3f0 drivers/gpu/drm/drm_ioctl.c:744
 drm_ioctl+0x582/0xb70 drivers/gpu/drm/drm_ioctl.c:841
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x1a1/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f1716e8eeed
Code: c3 e8 97 2b 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1717ba5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1716fe3f80 RCX: 00007f1716e8eeed
RDX: 00000000200003c0 RSI: 00000000c01864c6 RDI: 0000000000000003
RBP: 00007f1716f13014 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f1716fe3f80 R15: 00007f1717b85000
 </TASK>

Reported-by: Ubisectech Sirius <bugreport at ubisectech.com>
Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/drm_lease.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index 94375c6a5425..338716640725 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -386,8 +386,8 @@ static int fill_object_idr(struct drm_device *dev,
 	int ret;
 	bool universal_planes = READ_ONCE(lessor_priv->universal_planes);
 
-	objects = kcalloc(object_count, sizeof(struct drm_mode_object *),
-			  GFP_KERNEL);
+	objects = kvcalloc(object_count, sizeof(struct drm_mode_object *),
+			   GFP_KERNEL);
 	if (!objects)
 		return -ENOMEM;
 
@@ -463,7 +463,7 @@ static int fill_object_idr(struct drm_device *dev,
 		if (objects[o])
 			drm_mode_object_put(objects[o]);
 	}
-	kfree(objects);
+	kvfree(objects);
 	return ret;
 }
 
-- 
2.45.0