CVE-2023-54062

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ext4: fix invalid free tracking in ext4_xattr_move_to_block()<br /> <br /> In ext4_xattr_move_to_block(), the value of the extended attribute<br /> which we need to move to an external block may be allocated by<br /> kvmalloc() if the value is stored in an external inode. So at the end<br /> of the function the code tried to check if this was the case by<br /> testing entry-&gt;e_value_inum.<br /> <br /> However, at this point, the pointer to the xattr entry is no longer<br /> valid, because it was removed from the original location where it had<br /> been stored. So we could end up calling kvfree() on a pointer which<br /> was not allocated by kvmalloc(); or we could also potentially leak<br /> memory by not freeing the buffer when it should be freed. Fix this by<br /> storing whether it should be freed in a separate variable.