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drm/amdkfd: Unwind debug trap enable on copy_to_user failure

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If kfd_dbg_trap_enable() fails while copying runtime_info to userspace,
it had already activated the trap, set debug_trap_enabled, taken an extra
process reference, and opened the debug event file. Return -EFAULT without
unwinding that state, leaving inconsistent trap state and a refcount
imbalance that could break later DISABLE/ENABLE.

On copy_to_user failure, deactivate the trap and undo the rest of the
enable setup before returning.

Signed-off-by: Yongqiang Sun <Yongqiang.Sun@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yongqiang Sun 2026-06-02 09:59:44 -04:00 committed by Alex Deucher
parent bfc6042540
commit 01112e241e
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdkfd/kfd_debug.c
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@ -832,6 +832,12 @@ int kfd_dbg_trap_enable(struct kfd_process *target, uint32_t fd,
if (copy_to_user(runtime_info, (void *)&target->runtime_info, copy_size)) {
kfd_dbg_trap_deactivate(target, false, 0);
fput(target->dbg_ev_file);
target->dbg_ev_file = NULL;
if (target->debugger_process)
atomic_dec(&target->debugger_process->debugged_process_count);
target->debug_trap_enabled = false;
kfd_unref_process(target);
r = -EFAULT;
}