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In this scenario, the values > passed to them are accumulated statistics that might be extremely large > and exceed the upper limit of a 32-bit integer. > > Change the val parameter type from int to long in these functions and > their corresponding tracepoints (memcg_rstat_stats) to prevent potential > overflow issues. > > After that, in memcg_state_val_in_pages(), if the passed val is negative, > the expression val * unit / PAGE_SIZE could be implicitly converted to a > massive positive number when compared with 1UL in the max() macro. > This leads to returning an incorrect massive positive value. > > Fix this by using abs(val) to calculate the magnitude first, and then > restoring the sign of the value before returning the result. Additionally, > use mult_frac() to prevent potential overflow during the multiplication of > val and unit. > > Reported-by: Harry Yoo (Oracle) > Signed-off-by: Qi Zheng > Reviewed-by: Lorenzo Stoakes (Oracle) > --- > include/trace/events/memcg.h | 10 +++++----- > mm/memcontrol.c | 18 ++++++++++++------ > 2 files changed, 17 insertions(+), 11 deletions(-) > Acked-by: Zi Yan Best Regards, Yan, Zi