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arch: arm: userspace: fix syscall ID validation #23535

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ioannisg
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We need an unsigned comparison when evaluating whether
the supplied syscall ID is lower than the syscall ID limit.

Signed-off-by: Ioannis Glaropoulos Ioannis.Glaropoulos@nordicsemi.no

Manually backporting #23323 to 1.14 branch.

We need an unsigned comparison when evaluating whether
the supplied syscall ID is lower than the syscall ID limit.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
@ioannisg ioannisg added this to the v1.14.2 milestone Mar 17, 2020
@zephyrbot zephyrbot added the area: ARM ARM (32-bit) Architecture label Mar 17, 2020
@ioannisg ioannisg added the Backport Backport PR and backport failure issues label Mar 17, 2020
@ioannisg ioannisg added this to To do in Backports Mar 17, 2020
@carlescufi carlescufi moved this from To do to Ready in Backports Mar 24, 2020
@nashif nashif merged commit 6da1361 into zephyrproject-rtos:v1.14-branch Mar 24, 2020
Backports automation moved this from Ready to Done Mar 24, 2020
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