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xen/privcmd: Fix a possible warning in privcmd_ioctl_mmap_resource()

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[ 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: 3ad0876554 ("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>
This commit is contained in:
Harshit Mogalapalli 2022-11-25 21:07:45 -08:00 committed by Greg Kroah-Hartman
parent 29198f667f
commit 4f983ee5e5
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/privcmd.c
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@ -766,7 +766,7 @@ 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;