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authorJonathan Salwan <jonathan.salwan@gmail.com>2013-07-03 15:01:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:25 -0700
commit542db01579fbb7ea7d1f7bb9ddcef1559df660b2 (patch)
tree2f799eec82446074973943524f19d116a9414392 /block
parent8b0d77f13192678019f07cbc6b3338d6d91f1cf4 (diff)
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drivers/cdrom/cdrom.c: use kzalloc() for failing hardware
In drivers/cdrom/cdrom.c mmc_ioctl_cdrom_read_data() allocates a memory area with kmalloc in line 2885. 2885 cgc->buffer = kmalloc(blocksize, GFP_KERNEL); 2886 if (cgc->buffer == NULL) 2887 return -ENOMEM; In line 2908 we can find the copy_to_user function: 2908 if (!ret && copy_to_user(arg, cgc->buffer, blocksize)) The cgc->buffer is never cleaned and initialized before this function. If ret = 0 with the previous basic block, it's possible to display some memory bytes in kernel space from userspace. When we read a block from the disk it normally fills the ->buffer but if the drive is malfunctioning there is a chance that it would only be partially filled. The result is an leak information to userspace. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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