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author | Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | 2009-05-07 17:14:21 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-05-07 19:04:16 -0700 |
commit | 9e68177ef93b2f34eee5a1e1707bceef4b9ba69c (patch) | |
tree | 737c3245af23ec8b4cb9a1e05062f30ca37e4cb3 /drivers/mmc | |
parent | d07a9cba6be5c0e947afc1014b5a62182a86f1f1 (diff) |
Input: ff-memless - fix signed to unsigned bit overflow
When userspace sets effect->u.rumble.strong_magnitude to 0x8001 or
larger, ml_combine_effects() would always return strong_magnitude
0xffff.
Problem is that 'gain' is passed in as signed integer. Multiplying
magnitude (__u16) with gain (int) causes magnitude read as signed and
results negative value (with magnitude > 0x8000). This signed integer
is then divided and value, still negative, converted to 32bit unsigned
integer. Finally checking combine overflow min(new+old, 0xffff) gives
out 0xffff.
Fix is to simply change 'gain' to unsigned int.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/mmc')
0 files changed, 0 insertions, 0 deletions