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diff --git a/sys/fs/tarfs/tarfs_vfsops.c b/sys/fs/tarfs/tarfs_vfsops.c
--- a/sys/fs/tarfs/tarfs_vfsops.c
+++ b/sys/fs/tarfs/tarfs_vfsops.c
@@ -583,7 +583,8 @@
error = EINVAL;
goto bad;
}
- if (line + len > exthdr + sz) {
+ if ((uintptr_t)line + len < (uintptr_t)line ||
+ line + len > exthdr + sz) {
TARFS_DPF(ALLOC, "%s: exthdr overflow\n",
__func__);
error = EINVAL;

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