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Input: ims-pcu - check record size in ims_pcu_flash_firmware()

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The "len" variable comes from the firmware and we generally do
trust firmware, but it's always better to double check.  If the "len"
is too large it could result in memory corruption when we do
"memcpy(fragment->data, rec->data, len);"

Fixes: 628329d524 ("Input: add IMS Passenger Control Unit driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/131fd1ae92c828ee9f4fa2de03d8c210ae1f3524.1748463049.git.dan.carpenter@linaro.org
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dan Carpenter
2025-05-30 16:13:32 -07:00
committed by Dmitry Torokhov
parent 8f38219fa1
commit a95ef0199e
1 changed files with 6 additions and 0 deletions
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6
drivers/input/misc/ims-pcu.c
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@@ -844,6 +844,12 @@ static int ims_pcu_flash_firmware(struct ims_pcu *pcu,
addr = be32_to_cpu(rec->addr) / 2;
len = be16_to_cpu(rec->len);
if (len > sizeof(pcu->cmd_buf) - 1 - sizeof(*fragment)) {
dev_err(pcu->dev,
"Invalid record length in firmware: %d\n", len);
return -EINVAL;
}
fragment = (void *)&pcu->cmd_buf[1];
put_unaligned_le32(addr, &fragment->addr);
fragment->len = len;