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Fix fd range for select on Windows

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Fix mbedtls_net_poll() and mbedtls_net_recv_timeout() often failing with
MBEDTLS_ERR_NET_POLL_FAILED on Windows: they were testing that the file
descriptor is in range for fd_set, but on Windows socket descriptors are not
limited to a small range. Fixes #4465.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-06-20 22:01:36 +02:00
parent 05360005e3
commit a5dd7bded8
2 changed files with 9 additions and 0 deletions
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4
ChangeLog.d/winsock.txt Normal file
View file

@ -0,0 +1,4 @@
Bugfix
* Fix mbedtls_net_poll() and mbedtls_net_recv_timeout() often failing with
MBEDTLS_ERR_NET_POLL_FAILED on Windows. Fixes #4465.

5
library/net_sockets.c
View file

@ -145,12 +145,17 @@ static int check_fd( int fd, int for_select )
if( fd < 0 )
return( MBEDTLS_ERR_NET_INVALID_CONTEXT );
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
!defined(EFI32)
(void) for_select;
#else
/* A limitation of select() is that it only works with file descriptors
* that are strictly less than FD_SETSIZE. This is a limitation of the
* fd_set type. Error out early, because attempting to call FD_SET on a
* large file descriptor is a buffer overflow on typical platforms. */
if( for_select && fd >= FD_SETSIZE )
return( MBEDTLS_ERR_NET_POLL_FAILED );
#endif
return( 0 );
}