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Fix userland memory leak in zfs_do_send()
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Clang 15's static analyzer caught this.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #14045
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@ryao
ryao authored Oct 20, 2022
1 parent 5405be0 commit 219cf0f
Showing 1 changed file with 34 additions and 3 deletions.
37 changes: 34 additions & 3 deletions cmd/zfs/zfs_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4504,6 +4504,7 @@ zfs_do_send(int argc, char **argv)
gettext("missing argument for '%s' "
"option\n"), argv[optind - 1]);
}
free(excludes.list);
usage(B_FALSE);
break;
case '?':
Expand All @@ -4522,6 +4523,7 @@ zfs_do_send(int argc, char **argv)
argv[optind - 1]);

}
free(excludes.list);
usage(B_FALSE);
}
}
Expand All @@ -4530,6 +4532,7 @@ zfs_do_send(int argc, char **argv)
flags.verbosity = 1;

if (excludes.count > 0 && !flags.replicate) {
free(excludes.list);
(void) fprintf(stderr, gettext("Cannot specify "
"dataset exclusion (-X) on a non-recursive "
"send.\n"));
Expand All @@ -4543,21 +4546,25 @@ zfs_do_send(int argc, char **argv)
if (fromname != NULL || flags.replicate || flags.props ||
flags.backup || flags.holds ||
flags.saved || redactbook != NULL) {
free(excludes.list);
(void) fprintf(stderr,
gettext("invalid flags combined with -t\n"));
usage(B_FALSE);
}
if (argc > 0) {
free(excludes.list);
(void) fprintf(stderr, gettext("too many arguments\n"));
usage(B_FALSE);
}
} else {
if (argc < 1) {
free(excludes.list);
(void) fprintf(stderr,
gettext("missing snapshot argument\n"));
usage(B_FALSE);
}
if (argc > 1) {
free(excludes.list);
(void) fprintf(stderr, gettext("too many arguments\n"));
usage(B_FALSE);
}
Expand All @@ -4568,11 +4575,15 @@ zfs_do_send(int argc, char **argv)
flags.doall || flags.backup ||
flags.holds || flags.largeblock || flags.embed_data ||
flags.compress || flags.raw || redactbook != NULL) {
free(excludes.list);

(void) fprintf(stderr, gettext("incompatible flags "
"combined with saved send flag\n"));
usage(B_FALSE);
}
if (strchr(argv[0], '@') != NULL) {
free(excludes.list);

(void) fprintf(stderr, gettext("saved send must "
"specify the dataset with partially-received "
"state\n"));
Expand All @@ -4581,12 +4592,14 @@ zfs_do_send(int argc, char **argv)
}

if (flags.raw && redactbook != NULL) {
free(excludes.list);
(void) fprintf(stderr,
gettext("Error: raw sends may not be redacted.\n"));
return (1);
}

if (!flags.dryrun && isatty(STDOUT_FILENO)) {
free(excludes.list);
(void) fprintf(stderr,
gettext("Error: Stream can not be written to a terminal.\n"
"You must redirect standard output.\n"));
Expand All @@ -4595,19 +4608,24 @@ zfs_do_send(int argc, char **argv)

if (flags.saved) {
zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET);
if (zhp == NULL)
if (zhp == NULL) {
free(excludes.list);
return (1);
}

err = zfs_send_saved(zhp, &flags, STDOUT_FILENO,
resume_token);
free(excludes.list);
zfs_close(zhp);
return (err != 0);
} else if (resume_token != NULL) {
free(excludes.list);
return (zfs_send_resume(g_zfs, &flags, STDOUT_FILENO,
resume_token));
}

if (flags.skipmissing && !flags.replicate) {
free(excludes.list);
(void) fprintf(stderr,
gettext("skip-missing flag can only be used in "
"conjunction with replicate\n"));
Expand Down Expand Up @@ -4650,10 +4668,14 @@ zfs_do_send(int argc, char **argv)
}

zhp = zfs_open(g_zfs, argv[0], ZFS_TYPE_DATASET);
if (zhp == NULL)
if (zhp == NULL) {
free(excludes.list);
return (1);
}
err = zfs_send_one(zhp, fromname, STDOUT_FILENO, &flags,
redactbook);

free(excludes.list);
zfs_close(zhp);
return (err != 0);
}
Expand All @@ -4662,25 +4684,30 @@ zfs_do_send(int argc, char **argv)
(void) fprintf(stderr,
gettext("Error: multiple snapshots cannot be "
"sent from a bookmark.\n"));
free(excludes.list);
return (1);
}

if (redactbook != NULL) {
(void) fprintf(stderr, gettext("Error: multiple snapshots "
"cannot be sent redacted.\n"));
free(excludes.list);
return (1);
}

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

/*
* If they specified the full path to the snapshot, chop off
Expand All @@ -4700,13 +4727,17 @@ zfs_do_send(int argc, char **argv)
} else {
*cp = '\0';
if (cp != fromname && strcmp(argv[0], fromname)) {
zfs_close(zhp);
free(excludes.list);
(void) fprintf(stderr,
gettext("incremental source must be "
"in same filesystem\n"));
usage(B_FALSE);
}
fromname = cp + 1;
if (strchr(fromname, '@') || strchr(fromname, '/')) {
zfs_close(zhp);
free(excludes.list);
(void) fprintf(stderr,
gettext("invalid incremental source\n"));
usage(B_FALSE);
Expand Down

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