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SH_TAILQ_NEXT宏可能会导致潜在的死循环
Done
#I5D9LX
Bug
kouwq
Opened this issue
2022-06-21 10:05
src/dbinc/shqueue.h:264 宏SH_TAILQ_NEXT 可能会导致潜在的死循环 src/mp/mp_alloc.c:306 遍历buffer list ``` SH_TAILQ_FOREACH(current_bhp, &hp->hash_bucket, hq, __bh) { ``` src/dbinc/shqueue.h:316 ``` #define SH_TAILQ_FOREACH(var, head, field, type) \ for ((var) = SH_TAILQ_FIRST((head), type); \ (var) != NULL; \ (var) = SH_TAILQ_NEXT((var), field, type)) ``` src/dbinc/shqueue.h:264 ``` #define SH_TAILQ_NEXT(elm, field, type) \ ((elm)->field.stqe_next == -1 ? NULL : \ ((struct type *)((u_int8_t *)(elm) + (elm)->field.stqe_next))) ``` 当(elm)->field.stqe_next为0时，src/mp/mp_alloc.c:306会因为遍历到的buffer还是其自身而陷入死循环， 应该在SH_TAILQ_NEXT宏内保证程序的健壮性，而不能期待调用点不去传入一个异常的值。 修改mp_alloc.c:306附件的代码，使某个buffer的field.stqe_next为0，很容易可以dummy出，程序陷入死循环的现象。
src/dbinc/shqueue.h:264 宏SH_TAILQ_NEXT 可能会导致潜在的死循环 src/mp/mp_alloc.c:306 遍历buffer list ``` SH_TAILQ_FOREACH(current_bhp, &hp->hash_bucket, hq, __bh) { ``` src/dbinc/shqueue.h:316 ``` #define SH_TAILQ_FOREACH(var, head, field, type) \ for ((var) = SH_TAILQ_FIRST((head), type); \ (var) != NULL; \ (var) = SH_TAILQ_NEXT((var), field, type)) ``` src/dbinc/shqueue.h:264 ``` #define SH_TAILQ_NEXT(elm, field, type) \ ((elm)->field.stqe_next == -1 ? NULL : \ ((struct type *)((u_int8_t *)(elm) + (elm)->field.stqe_next))) ``` 当(elm)->field.stqe_next为0时，src/mp/mp_alloc.c:306会因为遍历到的buffer还是其自身而陷入死循环， 应该在SH_TAILQ_NEXT宏内保证程序的健壮性，而不能期待调用点不去传入一个异常的值。 修改mp_alloc.c:306附件的代码，使某个buffer的field.stqe_next为0，很容易可以dummy出，程序陷入死循环的现象。
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openEuler-24.03-LTS-Next
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