[PATCH 6.18.y] scsi: target: file: Use kzalloc_flex for aio_cmd

[Sasha Levin <sashal@kernel.org>]

From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>

[ Upstream commit 01f784fc9d0ab2a6dac45ee443620e517cb2a19b ]

The target_core_file doesn't initialize the aio_cmd->iocb for the
ki_write_stream. When a write command fd_execute_rw_aio() is executed,
we may get a bogus ki_write_stream value, causing unintended write
failure status when checking iocb->ki_write_stream > max_write_streams
in the block device.

Let's just use kzalloc_flex when allocating the aio_cmd and let
ki_write_stream=0 to fix this issue.

Fixes: 732f25a2895a ("fs: add a write stream field to the kiocb")
Fixes: c27683da6406 ("block: expose write streams for block device nodes")
Cc: stable@vger.kernel.org
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://patch.msgid.link/f1a2f81c62f043e31f80bb92d5f29893400c8ee2.1773450782.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[ changed kmalloc() to kzalloc() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/target/target_core_file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 2d78ef74633c8..80d0fc2a98067 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -276,7 +276,7 @@ fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 	ssize_t len = 0;
 	int ret = 0, i;
 
-	aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL);
+	aio_cmd = kzalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL);
 	if (!aio_cmd)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-- 
2.53.0