From: Steve French Date: Wed, 22 Feb 2006 23:31:52 +0000 (-0600) Subject: [PATCH] CIFS: CIFSSMBRead was returning an invalid pointer in buf on socket error X-Git-Tag: v2.6.16-rc5~62 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6cec2aed8686840906f6298391dc4fd04d9ba843;p=linux-2.6 [PATCH] CIFS: CIFSSMBRead was returning an invalid pointer in buf on socket error Thanks to Adrian Bunk for debugging the problem and to Shaggy for helping find the solution. Also added a fix for 64K pages we found in loosely-related testing Signed-off-by: Dave Kleikamp Signed-off-by: Steve French Signed-off-by: Linus Torvalds --- diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 217323b0c8..b41e8b3796 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1048,13 +1048,14 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, cifs_small_buf_release(iov[0].iov_base); else if(resp_buf_type == CIFS_LARGE_BUFFER) cifs_buf_release(iov[0].iov_base); - } else /* return buffer to caller to free */ /* BB FIXME how do we tell caller if it is not a large buffer */ { - *buf = iov[0].iov_base; + } else if(resp_buf_type != CIFS_NO_BUFFER) { + /* return buffer to caller to free */ + *buf = iov[0].iov_base; if(resp_buf_type == CIFS_SMALL_BUFFER) *pbuf_type = CIFS_SMALL_BUFFER; else if(resp_buf_type == CIFS_LARGE_BUFFER) *pbuf_type = CIFS_LARGE_BUFFER; - } + } /* else no valid buffer on return - leave as null */ /* Note: On -EAGAIN error only caller can retry on handle based calls since file handle passed in no longer valid */ diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index e488603fb1..ef5ae6f93c 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1795,10 +1795,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, conjunction with 52K kvec constraint on arch with 4K page size */ - if(cifs_sb->rsize < PAGE_CACHE_SIZE) { - cifs_sb->rsize = PAGE_CACHE_SIZE; - /* Windows ME does this */ - cFYI(1,("Attempt to set readsize for mount to less than one page (4096)")); + if(cifs_sb->rsize < 2048) { + cifs_sb->rsize = 2048; + /* Windows ME may prefer this */ + cFYI(1,("readsize set to minimum 2048")); } cifs_sb->mnt_uid = volume_info.linux_uid; cifs_sb->mnt_gid = volume_info.linux_gid;