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rxrpc: Fix checker warning

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Fix the following checker warning:

../net/rxrpc/key.c:692:9: error: subtraction of different types can't work (different address spaces)

Checker is wrong in this case, but cast the pointers to unsigned long to
avoid the warning.

Whilst we're at it, reduce the assertions to WARN_ON() and return an error.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
This commit is contained in:
David Howells
2022-12-01 12:24:36 +00:00
parent 91a7de8560
commit 84924aac08
1 changed files with 9 additions and 5 deletions
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14
net/rxrpc/key.c
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@@ -602,7 +602,8 @@ static long rxrpc_read(const struct key *key,
}
_debug("token[%u]: toksize=%u", ntoks, toksize);
ASSERTCMP(toksize, <=, AFSTOKEN_LENGTH_MAX);
if (WARN_ON(toksize > AFSTOKEN_LENGTH_MAX))
return -EIO;
toksizes[ntoks++] = toksize;
size += toksize + 4; /* each token has a length word */
@@ -679,8 +680,9 @@ static long rxrpc_read(const struct key *key,
return -ENOPKG;
}
ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,
toksize);
if (WARN_ON((unsigned long)xdr - (unsigned long)oldxdr ==
toksize))
return -EIO;
}
#undef ENCODE_STR
@@ -688,8 +690,10 @@ static long rxrpc_read(const struct key *key,
#undef ENCODE64
#undef ENCODE
ASSERTCMP(tok, ==, ntoks);
ASSERTCMP((char __user *) xdr - buffer, ==, size);
if (WARN_ON(tok != ntoks))
return -EIO;
if (WARN_ON((unsigned long)xdr - (unsigned long)buffer != size))
return -EIO;
_leave(" = %zu", size);
return size;
}