CVE-2024-41087

In the Linux kernel, the following vulnerability has been resolved:

ata: libata-core: Fix double free on error

If e.g. the ataportalloc() call in atahostalloc() fails, we will jump to the errout label, which will call devresreleasegroup(). devresreleasegroup() will trigger a call to atahostrelease(). atahostrelease() calls kfree(host), so executing the kfree(host) in atahost_alloc() will lead to a double free:

kernel BUG at mm/slub.c:553! Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 11 PID: 599 Comm: (udev-worker) Not tainted 6.10.0-rc5 #47 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014 RIP: 0010:kfree+0x2cf/0x2f0 Code: 5d 41 5e 41 5f 5d e9 80 d6 ff ff 4d 89 f1 41 b8 01 00 00 00 48 89 d9 48 89 da RSP: 0018:ffffc90000f377f0 EFLAGS: 00010246 RAX: ffff888112b1f2c0 RBX: ffff888112b1f2c0 RCX: ffff888112b1f320 RDX: 000000000000400b RSI: ffffffffc02c9de5 RDI: ffff888112b1f2c0 RBP: ffffc90000f37830 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000f37610 R11: 617461203a736b6e R12: ffffea00044ac780 R13: ffff888100046400 R14: ffffffffc02c9de5 R15: 0000000000000006 FS: 00007f2f1cabe980(0000) GS:ffff88813b380000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2f1c3acf75 CR3: 0000000111724000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ? __diebody.cold+0x19/0x27 ? die+0x2e/0x50 ? dotrap+0xca/0x110 ? doerrortrap+0x6a/0x90 ? kfree+0x2cf/0x2f0 ? excinvalidop+0x50/0x70 ? kfree+0x2cf/0x2f0 ? asmexcinvalidop+0x1a/0x20 ? atahostalloc+0xf5/0x120 [libata] ? atahostalloc+0xf5/0x120 [libata] ? kfree+0x2cf/0x2f0 atahostalloc+0xf5/0x120 [libata] atahostallocpinfo+0x14/0xa0 [libata] ahciinitone+0x6c9/0xd20 [ahci]

Ensure that we will not call kfree(host) twice, by performing the kfree() only if the devresopengroup() call failed.