The push_ascii function in smbd in Samba 3.6.x before 3.6.24, 4.0.x
before 4.0.19, and 4.1.x before 4.1.9 allows remote authenticated
users to cause a denial of service (memory corruption and daemon
crash) via an attempt to read a Unicode pathname without specifying
use of Unicode, leading to a character-set conversion failure that
triggers an invalid pointer dereference.
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