CVE-2022-50046

Summary

In the Linux kernel, the following vulnerability has been resolved:

net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

The issue happens on some error handling paths. When the function fails to grab the object xprt, it simply returns 0, forgetting to decrease the reference count of another object xps, which is increased by rpc_sysfs_xprt_kobj_get_xprt_switch(), causing refcount leaks. Also, the function forgets to check whether xps is valid before using it, which may result in NULL-dereferencing issues.

Fix it by adding proper error handling code when either xprt or xps is NULL.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < c0434f0e058648649250b8ed6078b66d773de723affected
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < 76fbeb1662b1c56514325118a07fba74dc4c79feaffected
LinuxLinux5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b < bfc48f1b0505ffcb03a6d749139b7577d6b81ae0affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.63 <= 5.15.*unaffected
LinuxLinux5.19.4 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

References