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tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev If the mmio_pipe_open() fails to find a PCI device, the hiter->dev will be assigned to NULL. The mmiotrace read() function dereferences the hiter->dev if hiter exists. Change the test of the read to not only check hiter being NULL, but also the hiter->dev before dereferencing it.

Affected products

Linux
  • <201a01102c529772168181190cb084471082cf5c
  • <faaf95135184208ee3ac6f33175c8d1800669dfc
  • ==2.6.27
  • =<*
  • =<6.6.*
  • =<6.18.*
  • <2.6.27
  • =<6.12.*
  • =<7.1.*
  • <144f29e85702234b23d2a62abf723e6a17eb5427
  • <8464427e1c177809a9488a97dfa2807d9dcf323b
  • <724cd84b0546c07806840fa658714488553d13a2