KVM: s390: vsie: Fix race in acquire_gmap_shadow()

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The shadow gmap returned by gmap_create_shadow() could get dropped
before taking the gmap->children_lock. This meant that the shadow gmap
was sometimes being used while its reference count was 0.

Fix this by taking the additional reference inside gmap_create_shadow()
while still holding gmap->children_lock, instead of afterwards.

Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

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Claudio Imbrenda 2026-02-06 15:35:53 +01:00

parent b6ab71a27c

commit f8f296ea1c

2 changed files with 17 additions and 4 deletions

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15

arch/s390/kvm/gmap.c

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6

arch/s390/kvm/vsie.c

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