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Commit 4f983ee5 authored by Harshit Mogalapalli's avatar Harshit Mogalapalli Committed by Greg Kroah-Hartman
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xen/privcmd: Fix a possible warning in privcmd_ioctl_mmap_resource()



[ 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: 3ad08765 ("xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE")
Signed-off-by: default avatarHarshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20221126050745.778967-1-harshit.m.mogalapalli@oracle.com


Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 29198f66
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