Re: 2.6.12-rc1-mm3 (cannot read cd-rom, 2.6.12-rc1 is OK)

[Andrew Morton <akpm@osdl.org>]

Andrew Morton <akpm@osdl.org> wrote:
>
> It's the new rock-ridge bounds checking.

Try this, please?

diff -puN fs/isofs/rock.c~rock-handle-directory-overflows-fix fs/isofs/rock.c
--- 25/fs/isofs/rock.c~rock-handle-directory-overflows-fix	Fri Mar 25 14:21:32 2005
+++ 25-akpm/fs/isofs/rock.c	Fri Mar 25 14:22:01 2005
@@ -218,12 +218,12 @@ repeat:
 		if (rr->len < 3)
 			goto out;	/* Something got screwed up here */
 		sig = isonum_721(rs.chr);
+		if (rock_check_overflow(&rs, sig))
+			goto eio;
 		rs.chr += rr->len;
 		rs.len -= rr->len;
 		if (rs.len < 0)
 			goto eio;	/* corrupted isofs */
-		if (rock_check_overflow(&rs, sig))
-			goto eio;
 
 		switch (sig) {
 		case SIG('R', 'R'):
@@ -316,12 +316,12 @@ repeat:
 		if (rr->len < 3)
 			goto out;	/* Something got screwed up here */
 		sig = isonum_721(rs.chr);
+		if (rock_check_overflow(&rs, sig))
+			goto eio;
 		rs.chr += rr->len;
 		rs.len -= rr->len;
 		if (rs.len < 0)
 			goto eio;	/* corrupted isofs */
-		if (rock_check_overflow(&rs, sig))
-			goto eio;
 
 		switch (sig) {
 #ifndef CONFIG_ZISOFS		/* No flag for SF or ZF */
@@ -694,12 +694,12 @@ repeat:
 		if (rr->len < 3)
 			goto out;	/* Something got screwed up here */
 		sig = isonum_721(rs.chr);
+		if (rock_check_overflow(&rs, sig))
+			goto out;
 		rs.chr += rr->len;
 		rs.len -= rr->len;
 		if (rs.len < 0)
 			goto out;	/* corrupted isofs */
-		if (rock_check_overflow(&rs, sig))
-			goto out;
 
 		switch (sig) {
 		case SIG('R', 'R'):
_