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drm/panthor: skip zero-sized firmware sections

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panthor_fw_load_section_entry() skips BO creation when the firmware section
VA range is empty. If such a section is added to the firmware section list,
section->mem is left as NULL.

Later reload and unplug paths iterate over all firmware sections and
dereference section->mem, which can lead to a NULL pointer dereference.

Zero-sized firmware sections are valid, so accept them as no-op entries but
skip adding them to the section list.

Fixes: 2718d91816 ("drm/panthor: Add the FW logical block")
Cc: stable@vger.kernel.org
Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patch.msgid.link/20260724172621.63046-1-osama.abdelkader@gmail.com
Signed-off-by: Steven Price <steven.price@arm.com>
This commit is contained in:
Osama Abdelkader 2026-07-24 19:26:20 +02:00 committed by Steven Price
parent d6c075f797
commit 2b8f13d3c7
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/panthor/panthor_fw.c
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@ -603,6 +603,9 @@ static int panthor_fw_load_section_entry(struct panthor_device *ptdev,
return -EINVAL;
}
if (!section_size)
return 0;
name_len = iter->size - iter->offset;
section = drmm_kzalloc(&ptdev->base, sizeof(*section), GFP_KERNEL);