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safety check to ensure we dont send out beyond the users buffer

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(Imported from upstream's 011ee91105f00cb2465110ce6431b11b51556d08 and
f2ebe2a60eacf3e348898175be82971b57d72327)
This commit is contained in:
Adam Langley 2014-06-20 12:00:00 -07:00
parent f77452c572
commit 9611cfcb9f
1 changed files with 15 additions and 0 deletions
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15
ssl/s3_pkt.c
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@ -590,6 +590,21 @@ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
}
}
/* ensure that if we end up with a smaller value of data to write
* out than the the original len from a write which didn't complete
* for non-blocking I/O and also somehow ended up avoiding
* the check for this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as
* it must never be possible to end up with (len-tot) as a large
* number that will then promptly send beyond the end of the users
* buffer ... so we trap and report the error in a way the user
* will notice
*/
if ( len < tot)
{
OPENSSL_PUT_ERROR(SSL, ssl3_write_bytes, SSL_R_BAD_LENGTH);
return(-1);
}
n=(len-tot);
for (;;)
{