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part: Check partition parsed partition type before setting it #1168

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Merged
vojtechtrefny merged 1 commit into from
Feb 24, 2026
Merged

part: Check partition parsed partition type before setting it #1168

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17 changes: 15 additions & 2 deletions src/plugins/part.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1723,14 +1723,15 @@ static gboolean set_part_type (struct fdisk_context *cxt, gint part_num, const g
struct fdisk_partition *pa = NULL;
struct fdisk_parttype *ptype = NULL;
const gchar *label_name = NULL;
gchar *endptr = NULL;
gint status = 0;
gint part_id_int = 0;

/* check if part type/id is valid for MBR */
if (table_type == BD_PART_TABLE_MSDOS) {
part_id_int = g_ascii_strtoull (type_str, NULL, 0);
part_id_int = g_ascii_strtoull (type_str, &endptr, 0);

if (part_id_int == 0) {
if (part_id_int == 0 || endptr == NULL || *endptr != '\0') {
g_set_error (error, BD_PART_ERROR, BD_PART_ERROR_INVAL,
"Invalid partition id given: '%s'.", type_str);
return FALSE;
Expand Down Expand Up @@ -1772,6 +1773,18 @@ static gboolean set_part_type (struct fdisk_context *cxt, gint part_num, const g
return FALSE;
}

if (table_type == BD_PART_TABLE_MSDOS) {
/* for GPT types unknown by libfdisk might still be valid */
status = fdisk_parttype_is_unknown (ptype);
if (status != 0) {
g_set_error (error, BD_PART_ERROR, BD_PART_ERROR_INVAL,
"Invalid partition type given: '%s'.", type_str);
fdisk_unref_parttype (ptype);
fdisk_unref_partition (pa);
return FALSE;
}
}

status = fdisk_set_partition_type (cxt, part_num, ptype);
if (status != 0) {
g_set_error (error, BD_PART_ERROR, BD_PART_ERROR_FAIL,
Expand Down
10 changes: 10 additions & 0 deletions tests/part_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1312,6 +1312,16 @@ def test_set_part_id(self):
with self.assertRaises(GLib.GError):
BlockDev.part_set_part_id (self.loop_devs[0], ps.path, "0x85")

# some invalid ids
with self.assertRaises(GLib.GError):
BlockDev.part_set_part_id (self.loop_devs[0], ps.path, "83;id")

with self.assertRaises(GLib.GError):
BlockDev.part_set_part_id (self.loop_devs[0], ps.path, "0xfff")

with self.assertRaises(GLib.GError):
BlockDev.part_set_part_id (self.loop_devs[0], ps.path, "999")


class PartSetBootableFlagCase(PartTestCase):
def test_set_part_type(self):
Expand Down