On 06/05/2018 11:51 AM, Colin King wrote:
From: Colin Ian King <colin.k...@canonical.com>
Shifting unsigned char b by an int type can lead to sign-extension
overflow. For example, if b is 0xff and the shift is 24, then top
bit is sign-extended so the final value passed to writeq has all
the upper 32 bits set. Fix this by casting b to a 64 bit unsigned
before the shift.
Queued for next release. Thanks.
-corey
Detected by CoverityScan, CID#1465246 ("Unintended sign extension")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
drivers/char/ipmi/ipmi_si_mem_io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/ipmi/ipmi_si_mem_io.c
b/drivers/char/ipmi/ipmi_si_mem_io.c
index 1b869d530884..fd0ec8d6bf0e 100644
--- a/drivers/char/ipmi/ipmi_si_mem_io.c
+++ b/drivers/char/ipmi/ipmi_si_mem_io.c
@@ -51,7 +51,7 @@ static unsigned char mem_inq(const struct si_sm_io *io,
unsigned int offset)
static void mem_outq(const struct si_sm_io *io, unsigned int offset,
unsigned char b)
{
- writeq(b << io->regshift, (io->addr)+(offset * io->regspacing));
+ writeq((u64)b << io->regshift, (io->addr)+(offset * io->regspacing));
}
#endif
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