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SUNRPC: Fix crasher in gss_unwrap_resp_integ()

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If a zero length is passed to kmalloc() it returns 0x10, which is
not a valid address. gss_unwrap_resp_integ() subsequently crashes
when it attempts to dereference that pointer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2022-10-08 14:58:29 -04:00 committed by Anna Schumaker
parent f5ea16137a
commit 8a0fa3ff3b
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/auth_gss/auth_gss.c
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@ -1989,7 +1989,7 @@ gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred,
goto unwrap_failed;
mic.len = len;
mic.data = kmalloc(len, GFP_KERNEL);
if (!mic.data)
if (ZERO_OR_NULL_PTR(mic.data))
goto unwrap_failed;
if (read_bytes_from_xdr_buf(rcv_buf, offset, mic.data, mic.len))
goto unwrap_failed;