From: Wei Chen Date: Tue, 14 Mar 2023 16:54:21 +0000 (+0000) Subject: i2c: xgene-slimpro: Fix out-of-bounds bug in xgene_slimpro_i2c_xfer() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=272dc775a52f2b0d0d8e844e77fefa7df8ebc653;p=linux.git i2c: xgene-slimpro: Fix out-of-bounds bug in xgene_slimpro_i2c_xfer() 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 Cc: stable@vger.kernel.org Reviewed-by: Andi Shyti Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c index bba08cbce6e18..6c39881d9e0fe 100644 --- 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 slimpro_i2c_dev *ctx, u32 chip, 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);