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zfs send does not handle invalid input gracefully

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Due to some changes introduced in 30af21b 'zfs send' can crash when
provided with invalid inputs: this change attempts to add more checks
to the affected code paths.

Reviewed-by: Attila Fülöp <attila@fueloep.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #9001
This commit is contained in:
loli10K 2019-07-09 00:10:23 +02:00 committed by Brian Behlendorf
parent f664f1ee7f
commit 1d20b763bb
2 changed files with 11 additions and 1 deletions
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6
cmd/zfs/zfs_main.c
View File

@ -4338,7 +4338,11 @@ zfs_do_send(int argc, char **argv)
return (1);
}
cp = strchr(argv[0], '@');
if ((cp = strchr(argv[0], '@')) == NULL) {
(void) fprintf(stderr, gettext("Error: "
"Unsupported flag with filesystem or bookmark.\n"));
return (1);
}
*cp = '\0';
toname = cp + 1;
zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME);

6
lib/libzfs/libzfs_sendrecv.c
View File

@ -2422,6 +2422,10 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
}
zfs_handle_t *tosnap = zfs_open(zhp->zfs_hdl,
full_tosnap_name, ZFS_TYPE_SNAPSHOT);
if (tosnap == NULL) {
err = -1;
goto err_out;
}
err = send_prelim_records(tosnap, fromsnap, outfd,
flags->replicate || flags->props || flags->holds,
flags->replicate, flags->verbosity > 0, flags->dryrun,
@ -2707,6 +2711,8 @@ zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
if (from != NULL && strchr(from, '@')) {
zfs_handle_t *from_zhp = zfs_open(hdl, from,
ZFS_TYPE_DATASET);
if (from_zhp == NULL)
return (-1);
if (!snapshot_is_before(from_zhp, zhp)) {
zfs_close(from_zhp);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,