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misc: xilinx_sdfec: Prevent a divide by zero in xsdfec_reg0_write()

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The "psize" value comes from the user so we need to verify that it's
non-zero before we check if "n % psize" or it will crash.

Fixes: 20ec628e80 ("misc: xilinx_sdfec: Add ability to configure LDPC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/20190821070953.GC26957@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2019-08-21 10:09:53 +03:00 committed by Greg Kroah-Hartman
parent 129c3b082c
commit 56a635c0ec
1 changed files with 1 additions and 1 deletions
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drivers/misc/xilinx_sdfec.c
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@ -460,7 +460,7 @@ static int xsdfec_reg0_write(struct xsdfec_dev *xsdfec, u32 n, u32 k, u32 psize,
{
u32 wdata;
if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX ||
if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX || psize == 0 ||
(n > XSDFEC_REG0_N_MUL_P * psize) || n <= k || ((n % psize) != 0)) {
dev_dbg(xsdfec->dev, "N value is not in range");
return -EINVAL;