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authorSteve French <stfrench@microsoft.com>2021-07-22 22:35:15 +0300
committerSteve French <stfrench@microsoft.com>2021-07-22 22:35:15 +0300
commit7b09d4e0be94968b7c6c117e34ca90cea9c6d986 (patch)
treea4beaa3e841a8f10e30779d3876abd0601900f5f /fs/cifs
parent21a64910997e0c1d268bebf9b1217ba5804d592d (diff)
downloadlinux-7b09d4e0be94968b7c6c117e34ca90cea9c6d986.tar.xz
CIFS: Clarify SMB1 code for POSIX delete file
Coverity also complains about the way we calculate the offset (starting from the address of a 4 byte array within the header structure rather than from the beginning of the struct plus 4 bytes) for SMB1 CIFSPOSIXDelFile. This changeset doesn't change the address but makes it slightly clearer. Addresses-Coverity: 711519 ("Out of bounds write") Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifssmb.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index d4144c182604..65d1a65bfc37 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -873,8 +873,11 @@ PsxDelete:
InformationLevel) - 4;
offset = param_offset + params;
- /* Setup pointer to Request Data (inode type) */
- pRqD = (struct unlink_psx_rq *)(((char *)&pSMB->hdr.Protocol) + offset);
+ /* Setup pointer to Request Data (inode type).
+ * Note that SMB offsets are from the beginning of SMB which is 4 bytes
+ * in, after RFC1001 field
+ */
+ pRqD = (struct unlink_psx_rq *)((char *)(pSMB) + offset + 4);
pRqD->type = cpu_to_le16(type);
pSMB->ParameterOffset = cpu_to_le16(param_offset);
pSMB->DataOffset = cpu_to_le16(offset);