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Corrected a case where we could read uninited ABD memory

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For my sins, I started running valgrind over ztest to try and fix
that pesky intermittent "zloop dies with malloc errors" problem.

This one seemed exciting enough to merit cutting a PR for before
the rest get polished.

Suggested-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #12214
This commit is contained in:
Rich Ercolani 2021-12-03 16:13:21 -05:00 committed by GitHub
parent ddc026f59b
commit df42e20ac6
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 10 deletions
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23
module/zfs/arc.c
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@ -5682,17 +5682,20 @@ arc_read_done(zio_t *zio)
zio_crypt_decode_params_bp(bp, hdr->b_crypt_hdr.b_salt,
hdr->b_crypt_hdr.b_iv);
if (BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) {
void *tmpbuf;
if (zio->io_error == 0) {
if (BP_GET_TYPE(bp) == DMU_OT_INTENT_LOG) {
void *tmpbuf;
tmpbuf = abd_borrow_buf_copy(zio->io_abd,
sizeof (zil_chain_t));
zio_crypt_decode_mac_zil(tmpbuf,
hdr->b_crypt_hdr.b_mac);
abd_return_buf(zio->io_abd, tmpbuf,
sizeof (zil_chain_t));
} else {
zio_crypt_decode_mac_bp(bp, hdr->b_crypt_hdr.b_mac);
tmpbuf = abd_borrow_buf_copy(zio->io_abd,
sizeof (zil_chain_t));
zio_crypt_decode_mac_zil(tmpbuf,
hdr->b_crypt_hdr.b_mac);
abd_return_buf(zio->io_abd, tmpbuf,
sizeof (zil_chain_t));
} else {
zio_crypt_decode_mac_bp(bp,
hdr->b_crypt_hdr.b_mac);
}
}
}