Like commit f1f047bd7ce0 ("smb: client: Fix -Wstringop-overflow issues"),
adjust the memcpy() destination address to be based off the surrounding
object rather than based off the 4-byte "Protocol" member. This avoids a
build-time warning when compiling under CONFIG_FORTIFY_SOURCE with GCC 15:
In function 'fortify_memcpy_chk',
inlined from 'CIFSSMBSetPathInfo' at ../fs/smb/client/cifssmb.c:5358:2:
../include/linux/fortify-string.h:571:25: error: call to
'__write_overflow_field' declared with attribute warning: detected write beyond
size of field (1st parameter); maybe use struct_group()?
[-Werror=attribute-warning]
571 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Kees Cook <[email protected]>
---
Cc: Steve French <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Paulo Alcantara <[email protected]>
Cc: Ronnie Sahlberg <[email protected]>
Cc: Shyam Prasad N <[email protected]>
Cc: Tom Talpey <[email protected]>
Cc: Bharath SM <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
fs/smb/client/cifssmb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index b96ca9be5352..026d6b5f23a9 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -5337,7 +5337,7 @@ CIFSSMBSetPathInfo(const unsigned int xid, struct
cifs_tcon *tcon,
param_offset = offsetof(struct smb_com_transaction2_spi_req,
InformationLevel) - 4;
offset = param_offset + params;
- data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
+ data_offset = (char *)pSMB + offsetof(typeof(*pSMB), hdr.Protocol) +
offset;
pSMB->ParameterOffset = cpu_to_le16(param_offset);
pSMB->DataOffset = cpu_to_le16(offset);
pSMB->SetupCount = 1;
--
2.34.1
