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i2c: xgene-slimpro: Fix out-of-bounds bug in xgene_slimpro_i2c_xfer()

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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: f6505fbabc ("i2c: add SLIMpro I2C device driver on APM X-Gene platform")
Signed-off-by: Wei Chen <harperchen1110@gmail.com>
Cc: stable@vger.kernel.org
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Wei Chen 2023-03-14 16:54:21 +00:00 committed by Wolfram Sang
parent d982635126
commit 92fbb6d129
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/busses/i2c-xgene-slimpro.c
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@ -308,6 +308,9 @@ static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
u32 msg[3]; u32 msg[3];
int rc; int rc;
if (writelen > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
memcpy(ctx->dma_buffer, data, writelen); memcpy(ctx->dma_buffer, data, writelen);
paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen, paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
DMA_TO_DEVICE); DMA_TO_DEVICE);