PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 95% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails
When vm_insert_page() fails in p2pmem_alloc_mmap(), p2pmem_alloc_mmap()
doesn't invoke percpu_ref_put() to free the per-CPU ref of pgmap acquired
after gen_pool_alloc_owner(), and memunmap_pages() will hang forever when
trying to remove the PCI device.
Fix it by adding the missed percpu_ref_put().
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/51b7181cfbedf289ce794b6d97a1c596c309ec38https://git.kernel.org/stable/c/6220694c52a5a04102b48109e4f24e958b559bd3https://git.kernel.org/stable/c/a1f4dc72efc3204db95d052058d785cad7ce755fhttps://git.kernel.org/stable/c/baa42b756d183a59572f3890981a3d32b8d05d40https://git.kernel.org/stable/c/e19cce88ec4c4877f4ff2469099b9cf23cc3e93e