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Suppress Clang Static Analyzer warning in dbuf_dnode_findbp()

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Clang's static analyzer reports that if a `blkid == DMU_SPILL_BLKID` is
passed, then we can have a NULL pointer dereference when either
->dn_have_spill or `DNODE_FLAG_SPILL_BLKPTR` is not set. This should not
happen. We add an `ASSERT()` to suppress reports about NULL pointer
dereferences.

Originally, I wanted to use one or two IMPLY statements on
pre-conditions before the call to `dbuf_findbp()`, but Clang's static
analyzer did not understand it.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #14575
This commit is contained in:
Richard Yao 2023-03-04 16:11:49 -05:00 committed by Brian Behlendorf
parent 399bb81607
commit f9e109223b
1 changed files with 1 additions and 0 deletions
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module/zfs/dbuf.c
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@ -3187,6 +3187,7 @@ dbuf_dnode_findbp(dnode_t *dn, uint64_t level, uint64_t blkid,
err = dbuf_findbp(dn, level, blkid, B_FALSE, &dbp, &bp2);
if (err == 0) {
ASSERT3P(bp2, !=, NULL);
*bp = *bp2;
if (dbp != NULL)
dbuf_rele(dbp, NULL);