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linuxkpi: Ignore NULL pointers passed to string parameter of kstr(n)dup

Description

linuxkpi: Ignore NULL pointers passed to string parameter of kstr(n)dup

That follows Linux and fixes related drm-kmod-5.3 panic.

Reviewed by: imp, hselasky
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D25657

Details

Provenance
wulfAuthored on
Reviewer
imp
Differential Revision
D25657: linuxkpi: Ignore NULL passed to string parametr of kstrdup()
Parents
rS363204: Tag sendmail 8.16.1
Branches
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