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Index: sys/kern/kern_sendfile.c
===================================================================
--- sys/kern/kern_sendfile.c
+++ sys/kern/kern_sendfile.c
@@ -1007,8 +1007,15 @@
uap->nbytes, &sbytes, uap->flags, td);
fdrop(fp, td);
- if (uap->sbytes != NULL)
- copyout(&sbytes, uap->sbytes, sizeof(off_t));
+ /*
+ * Only copy out the number of bytes if fo_sendfile did not fail or
+ * failed with EAGAIN or EINTR.
+ */
+ if (error == 0 || error == EAGAIN || error == EINTR) {
+ if (uap->sbytes != NULL) {
+ error = copyout(&sbytes, uap->sbytes, sizeof(off_t));
+ }
+ }
out:
free(hdr_uio, M_IOV);

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