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KVM: x86: Fix potential fput on a null source_kvm_file

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The fget can potentially return null, so the fput on the error return
path can cause a null pointer dereference. Fix this by checking for
a null source_kvm_file before doing a fput.

Addresses-Coverity: ("Dereference null return")
Fixes: 54526d1fd5 ("KVM: x86: Support KVM VMs sharing SEV context")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Message-Id: <20210430170303.131924-1-colin.king@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Colin Ian King 2021-04-30 18:03:03 +01:00 • committed by Paolo Bonzini
parent 7f6231a391
commit 8899a5fc7d
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/svm/sev.c
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@ -1764,7 +1764,8 @@ e_mirror_unlock:
e_source_unlock:
mutex_unlock(&source_kvm->lock);
e_source_put:
fput(source_kvm_file);
if (source_kvm_file)
fput(source_kvm_file);
return ret;
}