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--- a/bsd-user/freebsd/os-sys.c
+++ b/bsd-user/freebsd/os-sys.c
@@ -165,7 +165,9 @@ abi_long do_freebsd_sysctl(CPUArchState
switch (snamep[1]) {
case KERN_USRSTACK:
#if TARGET_USRSTACK != 0
- (*(abi_ulong *)holdp) = tswapal(TARGET_USRSTACK);
+ if (oldlen) {
+ (*(abi_ulong *)holdp) = tswapal(TARGET_USRSTACK);
+ }
holdlen = sizeof(abi_ulong);
ret = 0;
#else
@@ -175,7 +177,9 @@ abi_long do_freebsd_sysctl(CPUArchState
case KERN_PS_STRINGS:
#if defined(TARGET_PS_STRINGS)
- (*(abi_ulong *)holdp) = tswapal(TARGET_PS_STRINGS);
+ if (oldlen) {
+ (*(abi_ulong *)holdp) = tswapal(TARGET_PS_STRINGS);
+ }
holdlen = sizeof(abi_ulong);
ret = 0;
#else
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