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Backup errno in net_would_block

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Safe and restore the value of errno in net_would_block to be sure
it's not affected by the guarding call to fcntl. Fixes #845.
This commit is contained in:
Hanno Becker 2017-05-12 16:22:21 +01:00
parent 98864d5c0b
commit cc4d80fde3
2 changed files with 12 additions and 1 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date) mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS x.x.x branch released xxxx-xx-xx
Bugfix
* Fix net_would_block to avoid modification by errno through fcntl call.
Found by nkolban. Fixes #845.
= mbed TLS 1.3.19 branch released 2017-03-08 = mbed TLS 1.3.19 branch released 2017-03-08
Security Security

7
library/net.c
View File

@ -396,13 +396,18 @@ static int net_would_block( int fd )
*/ */
static int net_would_block( int fd ) static int net_would_block( int fd )
{ {
int err = errno;
/* /*
* Never return 'WOULD BLOCK' on a non-blocking socket * Never return 'WOULD BLOCK' on a non-blocking socket
*/ */
if( ( fcntl( fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK ) if( ( fcntl( fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
{
errno = err;
return( 0 ); return( 0 );
}
switch( errno ) switch( errno = err )
{ {
#if defined EAGAIN #if defined EAGAIN
case EAGAIN: case EAGAIN: