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Commit e3489f8974 ("selinux: kill selinux_sb_get_mnt_opts()")
introduced a NULL check on the context after a successful call to
security_sid_to_context(). This is on the one hand redundant after
checking for success and on the other hand insufficient on an actual
NULL pointer, since the context is passed to seq_escape() leading to a
call of strlen() on it.
Reported by Clang analyzer:
In file included from security/selinux/hooks.c:28:
In file included from ./include/linux/tracehook.h:50:
In file included from ./include/linux/memcontrol.h:13:
In file included from ./include/linux/cgroup.h:18:
./include/linux/seq_file.h:136:25: warning: Null pointer passed as 1st argument to string length function [unix.cstring.NullArg]
seq_escape_mem(m, src, strlen(src), flags, esc);
^~~~~~~~~~~
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
4d3d0ed60e