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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2026 08:09:00.1561 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0b2784a-a798-4667-40e2-08de5cb2297f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0FC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6547 On Sat, 24 Jan 2026 18:18:27 -0500 Joel Fernandes wrote: > Use checked_add() when computing signature offsets from firmware- > provided values in signatures_iter(). > > Without checked arithmetic, overflow could wrap to a small plausible > offset that points to entirely wrong data. > > Signed-off-by: Joel Fernandes > --- > drivers/gpu/nova-core/firmware/booter.rs | 19 ++++++++++++++----- > 1 file changed, 14 insertions(+), 5 deletions(-) > > diff --git a/drivers/gpu/nova-core/firmware/booter.rs > b/drivers/gpu/nova-core/firmware/booter.rs index > 86556cee8e67..f5ad619dc055 100644 --- > a/drivers/gpu/nova-core/firmware/booter.rs +++ > b/drivers/gpu/nova-core/firmware/booter.rs @@ -119,14 +119,23 @@ fn > signatures_iter(&'a self) -> Result BooterSignature<'a>> Some(sig_size) => { let patch_sig = > frombytes_at::(self.fw, > self.hdr.patch_sig_offset.into_safe_cast())?; > - let signatures_start = > usize::from_safe_cast(self.hdr.sig_prod_offset + patch_sig); + > + // Compute signatures_start = hdr.sig_prod_offset + > patch_sig. > + let signatures_start = self > + .hdr > + .sig_prod_offset > + .checked_add(patch_sig) > + .map(usize::from_safe_cast) > + .ok_or(EINVAL)?; > + > + // Compute signatures_end = signatures_start + > hdr.sig_prod_size. > + let signatures_end = signatures_start > + > .checked_add(usize::from_safe_cast(self.hdr.sig_prod_size)) > + .ok_or(EINVAL)?; > The same concern of comment format in PATCH 1 raised by Dirk, With that addressed, Reviewed-by: Zhi Wang > self.fw > // Get signatures range. > - .get( > - signatures_start > - ..signatures_start + > usize::from_safe_cast(self.hdr.sig_prod_size), > - ) > + .get(signatures_start..signatures_end) > .ok_or(EINVAL)? > .chunks_exact(sig_size.into_safe_cast()) > }