On 15/06/26 15:06, Ritesh Harjani (IBM) wrote:
Sayali Patil <[email protected]> writes:
The MIN_RMA size checks in fadump_setup_param_area() use
(MIN_RMA * 1024 * 1024), which is evaluated in int and can
overflow when MIN_RMA is increased to values such as SZ_2G.
This triggers compiler warnings such as:
warning: integer overflow in expression of type 'int'
results in '0' [-Woverflow]
Define MIN_RMA directly in bytes using SZ_1M and update the
callers accordingly. This avoids repeated unit conversions and
prevents integer overflow.
Also convert MIN_RMA back to MB when populating the firmware
architecture vector, since firmware expects the value in MB.
Fixes: b7bb46062457 ("powerpc/fadump: fix additional param memory reservation for
HASH MMU")
Since this is not a bug per-se, so we need not add a Fixes tag.
But while we are at it, we may correct the commit subject to...
powerpc/fadump: Define MIN_RMA in bytes rather than MB
... since there is no overflow with it's current value.
With the above changes in place, feel free to add:
Reviewed-by: Ritesh Harjani (IBM) <[email protected]>
Sent out v3 incorporating the requested changes.
V3:
https://lore.kernel.org/all/310b040acef712fdc79e3e37d0f4c2213938b556.1781589284.git.saya...@linux.ibm.com/
Thanks,
Sayali
