The prior strscpy() replacement of strncpy() here expected the manufacture_reply strings to be NUL-terminated, but it is possible they are not, as the code pattern here shows, e.g., edev->vendor_id being exactly 1 character larger than manufacture_reply->vendor_id, and the replaced strncpy() was copying only up to the size of the source character array. Replace this with memtostr(), which is the unambiguous way to convert a maybe not-NUL-terminated character array into a NUL-terminated string.
Reported-by: Charles Bertsch <cbert...@cox.net> Closes: https://lore.kernel.org/all/5445ba0f-3e27-4d43-a9ba-0cc22ada2...@cox.net/ Fixes: 45e833f0e5bb ("scsi: message: fusion: Replace deprecated strncpy() with strscpy()") Signed-off-by: Kees Cook <keesc...@chromium.org> --- Cc: Justin Stitt <justinst...@google.com> Cc: Sathya Prakash <sathya.prak...@broadcom.com> Cc: Sreekanth Reddy <sreekanth.re...@broadcom.com> Cc: Suganath Prabu Subramani <suganath-prabu.subram...@broadcom.com> Cc: mpt-fusionlinux....@broadcom.com Cc: linux-s...@vger.kernel.org --- drivers/message/fusion/mptsas.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c index 300f8e955a53..0f80c840afc3 100644 --- a/drivers/message/fusion/mptsas.c +++ b/drivers/message/fusion/mptsas.c @@ -2964,17 +2964,13 @@ mptsas_exp_repmanufacture_info(MPT_ADAPTER *ioc, goto out_free; manufacture_reply = data_out + sizeof(struct rep_manu_request); - strscpy(edev->vendor_id, manufacture_reply->vendor_id, - sizeof(edev->vendor_id)); - strscpy(edev->product_id, manufacture_reply->product_id, - sizeof(edev->product_id)); - strscpy(edev->product_rev, manufacture_reply->product_rev, - sizeof(edev->product_rev)); + memtostr(edev->vendor_id, manufacture_reply->vendor_id); + memtostr(edev->product_id, manufacture_reply->product_id); + memtostr(edev->product_rev, manufacture_reply->product_rev); edev->level = manufacture_reply->sas_format; if (manufacture_reply->sas_format) { - strscpy(edev->component_vendor_id, - manufacture_reply->component_vendor_id, - sizeof(edev->component_vendor_id)); + memtostr(edev->component_vendor_id, + manufacture_reply->component_vendor_id); tmp = (u8 *)&manufacture_reply->component_id; edev->component_id = tmp[0] << 8 | tmp[1]; edev->component_revision_id = -- 2.34.1
