From: David Howells dhowells@redhat.com
[ Upstream commit d52e419ac8b50c8bef41b398ed13528e75d7ad48 ]
Clang static analysis reports the following:
net/rxrpc/key.c:657:11: warning: Assigned value is garbage or undefined toksize = toksizes[tok++]; ^ ~~~~~~~~~~~~~~~
rxrpc_read() contains two consecutive loops. The first loop calculates the token sizes and stores the results in toksizes[] and the second one uses the array. When there is an error in identifying the token in the first loop, the token is skipped, no change is made to the toksizes[] array. When the same error happens in the second loop, the token is not skipped. This will cause the toksizes[] array to be out of step and will overrun past the calculated sizes.
Fix this by making both loops log a message and return an error in this case. This should only happen if a new token type is incompletely implemented, so it should normally be impossible to trigger this.
Fixes: 9a059cd5ca7d ("rxrpc: Downgrade the BUG() for unsupported token type in rxrpc_read()") Reported-by: Tom Rix trix@redhat.com Signed-off-by: David Howells dhowells@redhat.com Reviewed-by: Tom Rix trix@redhat.com Link: https://lore.kernel.org/r/161046503122.2445787.16714129930607546635.stgit@wa... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/rxrpc/ar-key.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/net/rxrpc/ar-key.c +++ b/net/rxrpc/ar-key.c @@ -1116,7 +1116,7 @@ static long rxrpc_read(const struct key default: /* we have a ticket we can't encode */ pr_err("Unsupported key token type (%u)\n", token->security_index); - continue; + return -ENOPKG; }
_debug("token[%u]: toksize=%u", ntoks, toksize); @@ -1236,7 +1236,9 @@ static long rxrpc_read(const struct key break;
default: - break; + pr_err("Unsupported key token type (%u)\n", + token->security_index); + return -ENOPKG; }
ASSERTCMP((unsigned long)xdr - (unsigned long)oldxdr, ==,