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Subject[PATCH] fs/coda: Do not use partially allocated struct
Date
GCC 12 does not like seeing a partially allocated structure being used,
especially when a pointer is being passed out of function scope. Since
only the struct coda_in_hdr member of union inputArgs is being allocated
and used, just replace union inputArgs with struct coda_in_hdr.

../fs/coda/upcall.c: In function 'coda_upcall':
../fs/coda/upcall.c:801:22: warning: array subscript 'union inputArgs[0]' is partly outside array bounds of 'unsigned char[20]' [-Warray-bounds]
801 | sig_inputArgs->ih.opcode = CODA_SIGNAL;
| ^~
In file included from ../include/linux/fs.h:45,
from ../include/linux/huge_mm.h:8,
from ../include/linux/mm.h:700,
from ../fs/coda/upcall.c:22:
In function 'kvmalloc',
inlined from 'kvzalloc' at ../include/linux/slab.h:758:9,
inlined from 'coda_upcall' at ../fs/coda/upcall.c:794:18:
../include/linux/slab.h:750:16: note: object of size 20 allocated by 'kvmalloc_node'
750 | return kvmalloc_node(size, flags, NUMA_NO_NODE);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../fs/coda/upcall.c: In function 'coda_upcall':
../fs/coda/upcall.c:802:22: warning: array subscript 'union inputArgs[0]' is partly outside array bounds of 'unsigned char[20]' [-Warray-bounds]
802 | sig_inputArgs->ih.unique = req->uc_unique;
| ^~
In function 'kvmalloc',
inlined from 'kvzalloc' at ../include/linux/slab.h:758:9,
inlined from 'coda_upcall' at ../fs/coda/upcall.c:794:18:
../include/linux/slab.h:750:16: note: object of size 20 allocated by 'kvmalloc_node'
750 | return kvmalloc_node(size, flags, NUMA_NO_NODE);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: coda@cs.cmu.edu
Cc: codalist@coda.cs.cmu.edu
Signed-off-by: Kees Cook <keescook@chromium.org>
---
fs/coda/upcall.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/fs/coda/upcall.c b/fs/coda/upcall.c
index 59f6cfd06f96..21e4f5f446b2 100644
--- a/fs/coda/upcall.c
+++ b/fs/coda/upcall.c
@@ -711,7 +711,7 @@ static int coda_upcall(struct venus_comm *vcp,
union inputArgs *buffer)
{
union outputArgs *out;
- union inputArgs *sig_inputArgs;
+ struct coda_in_hdr *ih;
struct upc_req *req = NULL, *sig_req;
int error;

@@ -791,22 +791,22 @@ static int coda_upcall(struct venus_comm *vcp,
sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
if (!sig_req) goto exit;

- sig_inputArgs = kvzalloc(sizeof(struct coda_in_hdr), GFP_KERNEL);
- if (!sig_inputArgs) {
+ ih = kvzalloc(sizeof(*ih), GFP_KERNEL);
+ if (!ih) {
kfree(sig_req);
goto exit;
}

error = -EINTR;
- sig_inputArgs->ih.opcode = CODA_SIGNAL;
- sig_inputArgs->ih.unique = req->uc_unique;
+ ih->opcode = CODA_SIGNAL;
+ ih->unique = req->uc_unique;

sig_req->uc_flags = CODA_REQ_ASYNC;
- sig_req->uc_opcode = sig_inputArgs->ih.opcode;
- sig_req->uc_unique = sig_inputArgs->ih.unique;
- sig_req->uc_data = (void *)sig_inputArgs;
- sig_req->uc_inSize = sizeof(struct coda_in_hdr);
- sig_req->uc_outSize = sizeof(struct coda_in_hdr);
+ sig_req->uc_opcode = ih->opcode;
+ sig_req->uc_unique = ih->unique;
+ sig_req->uc_data = (void *)ih;
+ sig_req->uc_inSize = sizeof(*ih);
+ sig_req->uc_outSize = sizeof(*ih);

/* insert at head of queue! */
list_add(&(sig_req->uc_chain), &vcp->vc_pending);
--
2.32.0
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