When testing pnfs in virtual linux based on VirtualBox,
blkmapd gets dev_root->len == 0, which causes it Segmentation fault.
Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
---
utils/blkmapd/device-inq.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/utils/blkmapd/device-inq.c b/utils/blkmapd/device-inq.c
index eabc70c..c5bf71f 100644
--- a/utils/blkmapd/device-inq.c
+++ b/utils/blkmapd/device-inq.c
@@ -179,6 +179,7 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename)
char *buffer;
struct bl_dev_id *dev_root, *dev_id;
unsigned int pos, len, current_id = 0;
+ size_t devid_len = sizeof(struct bl_dev_id) - sizeof(unsigned char);
status = bldev_inquire_pages(fd, 0x83, &buffer);
if (status)
@@ -189,7 +190,11 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename)
pos = 0;
current_id = 0;
len = dev_root->len;
- while (pos < (len - sizeof(struct bl_dev_id) + sizeof(unsigned char))) {
+
+ if (len < devid_len)
+ goto out;
+
+ while (pos < (len - devid_len)) {
dev_id = (struct bl_dev_id *)&(dev_root->data[pos]);
if ((dev_id->ids & 0xf) < current_id)
continue;
@@ -221,8 +226,7 @@ struct bl_serial *bldev_read_serial(int fd, const char *filename)
}
if (current_id == 3)
break;
- pos += (dev_id->len + sizeof(struct bl_dev_id) -
- sizeof(unsigned char));
+ pos += (dev_id->len + devid_len);
}
out:
if (!serial_out)
--
2.3.3
--
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