s390: fix handling of -1 in set{,fs}[gu]id16 syscalls

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For some reason, the implementation of some 16-bit ID system calls
(namely, setuid16/setgid16 and setfsuid16/setfsgid16) used type cast
instead of low2highgid/low2highuid macros for converting [GU]IDs, which
led to incorrect handling of value of -1 (which ought to be considered
invalid).

Discovered by strace test suite.

Cc: stable@vger.kernel.org
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Eugene Syromiatnikov 2018-01-15 20:38:17 +01:00 • committed by Martin Schwidefsky

parent 7fbf8315fb

commit 6dd0d2d22a

1 changed files with 4 additions and 4 deletions

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arch/s390/kernel/compat_linux.c

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