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[intel-sgx-kernel-dev,v3,1/7] intel_sgx: fix deadlock in sgx_ioc_enclave_create()

Message ID 20161130142323.5324-2-jarkko.sakkinen@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jarkko Sakkinen Nov. 30, 2016, 2:23 p.m. UTC 
up_read(&current->mm->mmap_sem) was missing when the VMA validation
fails.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/platform/x86/intel_sgx_ioctl.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/platform/x86/intel_sgx_ioctl.c b/drivers/platform/x86/intel_sgx_ioctl.c
index d54c410..db17b9f 100644
--- a/drivers/platform/x86/intel_sgx_ioctl.c
+++ b/drivers/platform/x86/intel_sgx_ioctl.c
@@ -575,6 +575,7 @@  static long sgx_ioc_enclave_create(struct file *filep, unsigned int cmd,
 	    vma->vm_start != secs->base ||
 	    vma->vm_end != (secs->base + secs->size)) {
 		ret = -EINVAL;
+		up_read(&current->mm->mmap_sem);
 		goto out;
 	}
 	encl->vma_cnt++;