* [pbs-devel] [PATCH proxmox-backup] tape: changer: handle invalid descriptor data from library in status page
@ 2021-07-26 7:20 Dominik Csapak
2021-07-26 8:06 ` [pbs-devel] applied: " Dietmar Maurer
0 siblings, 1 reply; 2+ messages in thread
From: Dominik Csapak @ 2021-07-26 7:20 UTC (permalink / raw)
To: pbs-devel
We get the descriptor length from the library and use that in
'chunks_exact', which panics on length 0. Catch that case
and bail out, since that makes no sense here anyway.
This could prevent a panic, in case a library sends wrong data.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
src/tape/changer/sg_pt_changer.rs | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/src/tape/changer/sg_pt_changer.rs b/src/tape/changer/sg_pt_changer.rs
index c94eaf2e..3124b96f 100644
--- a/src/tape/changer/sg_pt_changer.rs
+++ b/src/tape/changer/sg_pt_changer.rs
@@ -710,7 +710,13 @@ fn decode_element_status_page(
let descr_data = reader.read_exact_allocated(len)?;
- for descriptor in descr_data.chunks_exact(subhead.descriptor_length as usize) {
+ let descr_len = subhead.descriptor_length as usize;
+
+ if descr_len == 0 {
+ bail!("got elements, but descriptor length 0");
+ }
+
+ for descriptor in descr_data.chunks_exact(descr_len) {
let mut reader = &descriptor[..];
match subhead.element_type_code {
--
2.30.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* [pbs-devel] applied: [PATCH proxmox-backup] tape: changer: handle invalid descriptor data from library in status page
2021-07-26 7:20 [pbs-devel] [PATCH proxmox-backup] tape: changer: handle invalid descriptor data from library in status page Dominik Csapak
@ 2021-07-26 8:06 ` Dietmar Maurer
0 siblings, 0 replies; 2+ messages in thread
From: Dietmar Maurer @ 2021-07-26 8:06 UTC (permalink / raw)
To: Proxmox Backup Server development discussion, Dominik Csapak
applied
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-26 7:20 [pbs-devel] [PATCH proxmox-backup] tape: changer: handle invalid descriptor data from library in status page Dominik Csapak
2021-07-26 8:06 ` [pbs-devel] applied: " Dietmar Maurer
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