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A lock-unlock is missing in ASHMEM_SET_SIZE ioctl which can result in a race condition when mmap is called. After the !asma->file check, before setting asma->size, asma->file can be set in mmap. That would result in having different asma->size than the mapped memory size. Combined with ASHMEM_UNPIN ioctl and shrinker invocation, this can result in memory corruption. Bug: 66954097 Signed-off-by: Viktor Slavkovic <viktors@google.com> Change-Id: I268225133f96fde0fadd1ec621aafef27d392d65