From: Wei Chen <harperchen1110@xxxxxxxxx>
commit 92fbb6d1296f81f41f65effd7f5f8c0f74943d15 upstream.
The data->block[0] variable comes from user and is a number between
0-255. Without proper check, the variable may be very large to cause
an out-of-bounds when performing memcpy in slimpro_i2c_blkwr.
Fix this bug by checking the value of writelen.
Fixes: f6505fbabc42 ("i2c: add SLIMpro I2C device driver on APM X-Gene platform")
Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-xgene-slimpro.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/i2c/busses/i2c-xgene-slimpro.c
+++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
@@ -307,6 +307,9 @@ static int slimpro_i2c_blkwr(struct slim
u32 msg[3];
int rc;
+ if (writelen > I2C_SMBUS_BLOCK_MAX)
+ return -EINVAL;
+
memcpy(ctx->dma_buffer, data, writelen);
paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
DMA_TO_DEVICE);
