[PATCH 6.0 0164/1073] xen/privcmd: Fix a possible warning in privcmd_ioctl_mmap_resource()

Greg Kroah-Hartman
2022-12-28T15:14:48Z

From: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>

[ Upstream commit 8b997b2bb2c53b76a6db6c195930e9ab8e4b0c79 ]

As 'kdata.num' is user-controlled data, if user tries to allocate
memory larger than(>=) MAX_ORDER, then kcalloc() will fail, it
creates a stack trace and messes up dmesg with a warning.

Call trace:
-> privcmd_ioctl
--> privcmd_ioctl_mmap_resource

Add __GFP_NOWARN in order to avoid too large allocation warning.
This is detected by static analysis using smatch.

Fixes: 3ad0876554ca ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20221126050745.778967-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/xen/privcmd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index e88e8f6f0a33..719c5d1dda27 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -760,7 +760,7 @@ static long privcmd_ioctl_mmap_resource(struct file *file,
goto out;
}

- pfns = kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL);
+ pfns = kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL | __GFP_NOWARN);
if (!pfns) {
rc = -ENOMEM;
goto out;
--
2.35.1