| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.14 49/99] scsi: target: pscsi: Fix possible null-pointer dereference in pscsi_complete_cmd() | Date | Thu, 9 Sep 2021 20:15:08 -0400 |
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From: Tuo Li <islituo@gmail.com>
[ Upstream commit 0f99792c01d1d6d35b86e850e9ccadd98d6f3e0c ]
The return value of transport_kmap_data_sg() is assigned to the variable buf:
buf = transport_kmap_data_sg(cmd);
And then it is checked:
if (!buf) {
This indicates that buf can be NULL. However, it is dereferenced in the following statements:
if (!(buf[3] & 0x80)) buf[3] |= 0x80; if (!(buf[2] & 0x80)) buf[2] |= 0x80;
To fix these possible null-pointer dereferences, dereference buf and call transport_kunmap_data_sg() only when buf is not NULL.
Link: https://lore.kernel.org/r/20210810040414.248167-1-islituo@gmail.com Reported-by: TOTE Robot <oslab@tsinghua.edu.cn> Reviewed-by: Bodo Stroesser <bostroesser@gmail.com> Signed-off-by: Tuo Li <islituo@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/target/target_core_pscsi.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c index 2629d2ef3970..75ef52f008ff 100644 --- a/drivers/target/target_core_pscsi.c +++ b/drivers/target/target_core_pscsi.c @@ -620,17 +620,17 @@ static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status, buf = transport_kmap_data_sg(cmd); if (!buf) { ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */ - } - - if (cdb[0] == MODE_SENSE_10) { - if (!(buf[3] & 0x80)) - buf[3] |= 0x80; } else { - if (!(buf[2] & 0x80)) - buf[2] |= 0x80; - } + if (cdb[0] == MODE_SENSE_10) { + if (!(buf[3] & 0x80)) + buf[3] |= 0x80; + } else { + if (!(buf[2] & 0x80)) + buf[2] |= 0x80; + } - transport_kunmap_data_sg(cmd); + transport_kunmap_data_sg(cmd); + } } } after_mode_sense: -- 2.30.2
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