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KVM: s390: Fix leaking kvm_s390_mmu_cache in case of errors

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Fix a memory leak that can happen if gmap_ucas_map_one() or
kvm_s390_mmu_cache_topup() return error values.

Also fix a similar issue in gmap_set_limit().

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Fixes: a2c17f9270 ("KVM: s390: New gmap code")
Reported-by: Jiaxin Fan <jiaxin.fan@ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-05-19 17:01:11 +02:00
parent d0f2eb4493
commit 4df4b7cdf5
1 changed files with 3 additions and 4 deletions
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7
arch/s390/kvm/gmap.c
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@ -125,7 +125,7 @@ struct gmap *gmap_new_child(struct gmap *parent, gfn_t limit)
int gmap_set_limit(struct gmap *gmap, gfn_t limit)
{
struct kvm_s390_mmu_cache *mc;
struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;
int rc, type;
type = gmap_limit_to_type(limit);
@ -142,7 +142,6 @@ int gmap_set_limit(struct gmap *gmap, gfn_t limit)
rc = dat_set_asce_limit(mc, &gmap->asce, type);
} while (rc == -ENOMEM);
kvm_s390_free_mmu_cache(mc);
return 0;
}
@ -822,8 +821,8 @@ int gmap_ucas_translate(struct kvm_s390_mmu_cache *mc, struct gmap *gmap, gpa_t
int gmap_ucas_map(struct gmap *gmap, gfn_t p_gfn, gfn_t c_gfn, unsigned long count)
{
struct kvm_s390_mmu_cache *mc;
int rc;
struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;
int rc = 0;
mc = kvm_s390_new_mmu_cache();
if (!mc)