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microblaze: uaccess: Zero out destination on failed get_user()

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On failure get_user() is supposed to zero out the destination variable.
This is documented in the kdoc of the microblaze get_user()
implementation and validated in lib/tests/usercopy_kunit.c.

Currently that zeroing is missing.

Add it.

Fixes: 0d6de95326 ("microblaze_mmu_v2: uaccess MMU update")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: David Gow <david@davidgow.net>
Link: https://patch.msgid.link/20260914-kunit-microblaze-v2-1-7d5756e858f8@weissschuh.net
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Thomas Weißschuh 2026-09-14 01:50:08 +02:00 committed by Michal Simek
parent 5ac0aed54f
commit 54c35131e6
1 changed files with 2 additions and 1 deletions
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3
arch/microblaze/include/asm/uaccess.h
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@ -95,7 +95,8 @@ extern long __user_bad(void);
#define get_user(x, ptr) ({ \
const typeof(*(ptr)) __user *__gu_ptr = (ptr); \
access_ok(__gu_ptr, sizeof(*__gu_ptr)) ? \
__get_user(x, __gu_ptr) : -EFAULT; \
__get_user(x, __gu_ptr) : \
((x) = 0, -EFAULT); \
})
#define __get_user(x, ptr) \