sanchayanmaity/minix
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

PFS: verify nrbytes

Browse source
This commit is contained in:
Thomas Veerman 2013-01-25 11:57:32 +00:00
parent 042ecb4231
commit 0968a93748
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
servers/pfs/read.c
View file

@ -36,7 +36,7 @@ int fs_readwrite(message *fs_m_in, message *fs_m_out)
nrbytes = (unsigned) fs_m_in->REQ_NBYTES;
/* We can't read beyond the max file position */
if (nrbytes > MAX_FILE_POS) return(EFBIG);
if (nrbytes > PIPE_BUF) return(EFBIG);
/* Mark inode in use */
if ((get_inode(rip->i_dev, rip->i_num)) == NULL) return(err_code);
@ -48,7 +48,7 @@ int fs_readwrite(message *fs_m_in, message *fs_m_out)
* be beyond max signed value (i.e., MAX_FILE_POS).
*/
position = rip->i_size;
if (position > PIPE_BUF - (signed) nrbytes) {
if ((unsigned) position + nrbytes > PIPE_BUF) {
put_inode(rip);
put_block(rip->i_dev, rip->i_num);
return(EFBIG);