Mercurial > dropbear
changeset 1754:064f5be2fc45
Add buf_decrpos()
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sat, 24 Oct 2020 18:56:45 +0800 |
| parents | 7c0fcd19e492 |
| children | 9efceb851bea 4c5599435084 |
| files | buffer.c buffer.h keyimport.c signkey.c svr-authpubkey.c |
| diffstat | 5 files changed, 17 insertions(+), 11 deletions(-) [+] |
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--- a/buffer.c Fri Oct 23 20:53:58 2020 +0800 +++ b/buffer.c Sat Oct 24 18:56:45 2020 +0800 @@ -125,18 +125,23 @@ } } -/* increment the position by incr, negative values are allowed, to - * decrement the pos*/ -void buf_incrpos(buffer* buf, int incr) { +/* increment the position by incr */ +void buf_incrpos(buffer* buf, unsigned int incr) { if (incr > BUF_MAX_INCR - || incr < -BUF_MAX_INCR - || (unsigned int)((int)buf->pos + incr) > buf->len - || ((int)buf->pos + incr) < 0) { + || (buf->pos + incr) > buf->len) { dropbear_exit("Bad buf_incrpos"); } buf->pos += incr; } +/* decrement the position by decr */ +void buf_decrpos(buffer* buf, unsigned int decr) { + if (decr > buf->pos) { + dropbear_exit("Bad buf_decrpos"); + } + buf->pos -= decr; +} + /* Get a byte from the buffer and increment the pos */ unsigned char buf_getbyte(buffer* buf) {
--- a/buffer.h Fri Oct 23 20:53:58 2020 +0800 +++ b/buffer.h Sat Oct 24 18:56:45 2020 +0800 @@ -49,7 +49,8 @@ void buf_setlen(buffer* buf, unsigned int len); void buf_incrlen(buffer* buf, unsigned int incr); void buf_setpos(buffer* buf, unsigned int pos); -void buf_incrpos(buffer* buf, int incr); /* -ve is ok, to go backwards */ +void buf_incrpos(buffer* buf, unsigned int incr); +void buf_decrpos(buffer* buf, unsigned int decr); void buf_incrwritepos(buffer* buf, unsigned int incr); unsigned char buf_getbyte(buffer* buf); unsigned char buf_getbool(buffer* buf);
--- a/keyimport.c Fri Oct 23 20:53:58 2020 +0800 +++ b/keyimport.c Sat Oct 24 18:56:45 2020 +0800 @@ -637,7 +637,7 @@ buf_incrpos(blobbuf, 8); buf_eatstring(blobbuf); buf_eatstring(blobbuf); - buf_incrpos(blobbuf, -SSH_SIGNKEY_ED25519_LEN-4); + buf_decrpos(blobbuf, SSH_SIGNKEY_ED25519_LEN+4); if (buf_get_ed25519_priv_key(blobbuf, retkey->ed25519key) == DROPBEAR_SUCCESS) { errmsg = NULL;
--- a/signkey.c Fri Oct 23 20:53:58 2020 +0800 +++ b/signkey.c Sat Oct 24 18:56:45 2020 +0800 @@ -235,7 +235,7 @@ *type = keytype; /* Rewind the buffer back before "ssh-rsa" etc */ - buf_incrpos(buf, -len - 4); + buf_decrpos(buf, len + 4); #if DROPBEAR_DSS if (keytype == DROPBEAR_SIGNKEY_DSS) { @@ -316,7 +316,7 @@ *type = keytype; /* Rewind the buffer back before "ssh-rsa" etc */ - buf_incrpos(buf, -len - 4); + buf_decrpos(buf, len + 4); #if DROPBEAR_DSS if (keytype == DROPBEAR_SIGNKEY_DSS) {