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cmd64x: potential buffer overflow in cmd64x_program_timings()

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The "drive->dn" value is a u8 and it is controlled by root only, but
it could be out of bounds here so let's check.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2020-01-07 16:04:41 +03:00 committed by David S. Miller
parent 0fdeae5036
commit 117fcc3053
1 changed files with 3 additions and 0 deletions
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drivers/ide/cmd64x.c
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@ -66,6 +66,9 @@ static void cmd64x_program_timings(ide_drive_t *drive, u8 mode)
struct ide_timing t;
u8 arttim = 0;
if (drive->dn >= ARRAY_SIZE(drwtim_regs))
return;
ide_timing_compute(drive, mode, &t, T, 0);
/*