5.15-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
commit a95ef0199e80f3384eb992889322957d26c00102 upstream.
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: 628329d52474 ("Input: add IMS Passenger Control Unit driver") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Link: https://lore.kernel.org/r/131fd1ae92c828ee9f4fa2de03d8c210ae1f3524.174846304... Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/misc/ims-pcu.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/input/misc/ims-pcu.c +++ b/drivers/input/misc/ims-pcu.c @@ -845,6 +845,12 @@ static int ims_pcu_flash_firmware(struct 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;