Patch "jfs: validate max amount of blocks before allocation." has been added to the 5.15-stable tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a note to let you know that I've just added the patch titled

    jfs: validate max amount of blocks before allocation.

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     jfs-validate-max-amount-of-blocks-before-allocation.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 09d9eadbcb1e840f32a9e60c5b76df2fcdb05958
Author: Alexei Filippov <halip0503@xxxxxxxxx>
Date:   Sat Aug 19 20:32:16 2023 +0300

    jfs: validate max amount of blocks before allocation.
    
    [ Upstream commit 0225e10972fa809728b8d4c1bd2772b3ec3fdb57 ]
    
    The lack of checking bmp->db_max_freebud in extBalloc() can lead to
    shift out of bounds, so this patch prevents undefined behavior, because
    bmp->db_max_freebud == -1 only if there is no free space.
    
    Signed-off-by: Aleksei Filippov <halip0503@xxxxxxxxx>
    Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Reported-and-tested-by: syzbot+5f088f29593e6b4c8db8@xxxxxxxxxxxxxxxxxxxxxxxxx
    Closes: https://syzkaller.appspot.com/bug?id=01abadbd6ae6a08b1f1987aa61554c6b3ac19ff2
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/jfs/jfs_extent.c b/fs/jfs/jfs_extent.c
index bb4a342a193d4..6420b6749d48f 100644
--- a/fs/jfs/jfs_extent.c
+++ b/fs/jfs/jfs_extent.c
@@ -508,6 +508,11 @@ extBalloc(struct inode *ip, s64 hint, s64 * nblocks, s64 * blkno)
 	 * blocks in the map. in that case, we'll start off with the
 	 * maximum free.
 	 */
+
+	/* give up if no space left */
+	if (bmp->db_maxfreebud == -1)
+		return -ENOSPC;
+
 	max = (s64) 1 << bmp->db_maxfreebud;
 	if (*nblocks >= max && *nblocks > nbperpage)
 		nb = nblks = (max > nbperpage) ? max : nbperpage;



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux