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fix: Shift exponent too large

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Undefined operation is reported by running ztest (or zloop) compiled with GCC
UndefinedBehaviorSanitizer. Error only happens on top level of dnode indirection
with large enough offset values. Logically, left shift operation would work,
but bit shift semantics in C, and limitation of uint64_t, do not produce desired
result.

Issue #5059, #4883

Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
This commit is contained in:
Gvozden Neskovic
2016-08-31 10:12:08 +02:00
committed by Brian Behlendorf
parent 0b78aeae92
commit 031d7c2fe6
5 changed files with 38 additions and 9 deletions
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include/sys/dbuf.h
+2 -1
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@@ -270,7 +270,8 @@ typedef struct dbuf_hash_table {
kmutex_t hash_mutexes[DBUF_MUTEXES];
} dbuf_hash_table_t;
uint64_t dbuf_whichblock(struct dnode *di, int64_t level, uint64_t offset);
uint64_t dbuf_whichblock(const struct dnode *di, const int64_t level,
const uint64_t offset);
void dbuf_create_bonus(struct dnode *dn);
int dbuf_spill_set_blksz(dmu_buf_t *db, uint64_t blksz, dmu_tx_t *tx);