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-rw-r--r--sys/fs/fifofs/fifo_vnops.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
index 37dfcb9..fb84263 100644
--- a/sys/fs/fifofs/fifo_vnops.c
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -179,6 +179,8 @@ fifo_open(ap)
int error;
ASSERT_VOP_LOCKED(vp, "fifo_open");
+ if (ap->a_fdidx < 0)
+ return (EINVAL);
if ((fip = vp->v_fifoinfo) == NULL) {
MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, cred, td);
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