Messages in this thread Patch in this message | | | From | Kuninori Morimoto <> | Subject | [PATCH 1/2] mmc: cast u8 to unsigned long long to avoid unexpected error | Date | Tue, 14 Apr 2015 04:07:30 +0000 |
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From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
card->ext_csd.enhanced_area_offset is defined as "unsigned long long", and, ext_csd[] is defined as u8. unsigned long long data might have strange data if first bit of ext_csd[] was 1. this patch cast it to (unsigned long long) ex) u8 data8; u64 data64;
data8 = 0x80; data64 = (data8 << 24); // 0xffffffff80000000 data64 = (((unsigned long long)data8) << 24); // 0x80000000;
Reported-by: coverity <http://www.coverity.com> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> --- drivers/mmc/core/mmc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index c84131e..c6bb577 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -266,8 +266,10 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd) * calculate the enhanced data area offset, in bytes */ card->ext_csd.enhanced_area_offset = - (ext_csd[139] << 24) + (ext_csd[138] << 16) + - (ext_csd[137] << 8) + ext_csd[136]; + (((unsigned long long)ext_csd[139]) << 24) + + (((unsigned long long)ext_csd[138]) << 16) + + (((unsigned long long)ext_csd[137]) << 8) + + (((unsigned long long)ext_csd[136])); if (mmc_card_blockaddr(card)) card->ext_csd.enhanced_area_offset <<= 9; /* -- 1.9.1
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