[PATCH 5.14 091/432] scsi: ufs: Fix memory corruption by ufshcd_read_desc_param()

Greg Kroah-Hartman
2021-09-16T17:23:49Z

From: Bart Van Assche <bvanassche@acm.org>

[ Upstream commit d3d9c4570285090b533b00946b72647361f0345b ]

If param_offset > buff_len then the memcpy() statement in
ufshcd_read_desc_param() corrupts memory since it copies 256 + buff_len -
param_offset bytes into a buffer with size buff_len. Since param_offset <
256 this results in writing past the bound of the output buffer.

Link: https://lore.kernel.org/r/20210722033439.26550-2-bvanassche@acm.org
Fixes: cbe193f6f093 ("scsi: ufs: Fix potential NULL pointer access during memcpy")
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/ufs/ufshcd.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 708b3b62fc4d..179227180961 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3419,9 +3419,11 @@ int ufshcd_read_desc_param(struct ufs_hba *hba,

if (is_kmalloc) {
/* Make sure we don't copy more data than available */
- if (param_offset + param_size > buff_len)
- param_size = buff_len - param_offset;
- memcpy(param_read_buf, &desc_buf[param_offset], param_size);
+ if (param_offset >= buff_len)
+ ret = -EINVAL;
+ else
+ memcpy(param_read_buf, &desc_buf[param_offset],
+ min_t(u32, param_size, buff_len - param_offset));
}
out:
if (is_kmalloc)
--
2.30.2