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diff --git a/sys/kern/uipc_shm.c b/sys/kern/uipc_shm.c
--- a/sys/kern/uipc_shm.c
+++ b/sys/kern/uipc_shm.c
@@ -1915,8 +1915,8 @@
pi = OFF_TO_IDX(off + PAGE_MASK);
error = 0;
- /* Handle the case when offset is beyond shm size */
- if ((off_t)len < 0) {
+ /* Handle the case when offset is on or beyond shm size. */
+ if ((off_t)len <= 0) {
*offset = shmfd->shm_size;
*length = 0;
return (0);

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