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Subject[PATCH AUTOSEL 5.2 20/59] libata: zpodd: Fix small read overflow in zpodd_get_mech_type()
Date
From: Kees Cook <keescook@chromium.org>

[ Upstream commit 71d6c505b4d9e6f76586350450e785e3d452b346 ]

Jeffrin reported a KASAN issue:

BUG: KASAN: global-out-of-bounds in ata_exec_internal_sg+0x50f/0xc70
Read of size 16 at addr ffffffff91f41f80 by task scsi_eh_1/149
...
The buggy address belongs to the variable:
cdb.48319+0x0/0x40

Much like commit 18c9a99bce2a ("libata: zpodd: small read overflow in
eject_tray()"), this fixes a cdb[] buffer length, this time in
zpodd_get_mech_type():

We read from the cdb[] buffer in ata_exec_internal_sg(). It has to be
ATAPI_CDB_LEN (16) bytes long, but this buffer is only 12 bytes.

Reported-by: Jeffrin Jose T <jeffrin@rajagiritech.edu.in>
Fixes: afe759511808c ("libata: identify and init ZPODD devices")
Link: https://lore.kernel.org/lkml/201907181423.E808958@keescook/
Tested-by: Jeffrin Jose T <jeffrin@rajagiritech.edu.in>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/ata/libata-zpodd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c
index 173e6f2dd9af0..eefda51f97d35 100644
--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -56,7 +56,7 @@ static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
unsigned int ret;
struct rm_feature_desc *desc;
struct ata_taskfile tf;
- static const char cdb[] = { GPCMD_GET_CONFIGURATION,
+ static const char cdb[ATAPI_CDB_LEN] = { GPCMD_GET_CONFIGURATION,
2, /* only 1 feature descriptor requested */
0, 3, /* 3, removable medium feature */
0, 0, 0,/* reserved */
--
2.20.1
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