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vfs: fix UAF on VOP_RELEASE

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Matheus
2026-10-05 14:26:43 -03:00
parent e8da0eba6a
commit cc069554ae
1 changed files with 5 additions and 4 deletions
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kernel-src/include/kernel/vfs.h
+5 -4
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@@ -242,12 +242,13 @@ typedef struct vops_t {
#define VOP_SYNC(v) (v)->ops->sync(v) #define VOP_SYNC(v) (v)->ops->sync(v)
#define VOP_ADVLOCK(v, o, a) (v)->ops->advlock(v, o, a) #define VOP_ADVLOCK(v, o, a) (v)->ops->advlock(v, o, a)
#define VOP_HOLD(v) __atomic_add_fetch(&(v)->refcount, 1, __ATOMIC_SEQ_CST) #define VOP_HOLD(v) __atomic_add_fetch(&(v)->refcount, 1, __ATOMIC_SEQ_CST)
#define VOP_RELEASE(v) {\ #define VOP_RELEASE(v) do { \
if (__atomic_sub_fetch(&(v)->refcount, 1, __ATOMIC_SEQ_CST) == 0) {\ vnode_t *vop_release_node = (v); \
vfs_inactive(v); \ if (__atomic_sub_fetch(&vop_release_node->refcount, 1, __ATOMIC_SEQ_CST) == 0) { \
(v) = NULL; \ (v) = NULL; \
vfs_inactive(vop_release_node); \
} \ } \
} } while (0)
#define VFS_STUB(x) static int x () { return ENODEV; } #define VFS_STUB(x) static int x () { return ENODEV; }