Post fb041b598997d63c0f7d7305dfae70046bf66fe1 import_iovec

0000000000005344 <import_iovec>:
 * Return: Negative error code on error, bytes imported on success
 */
ssize_t import_iovec(int type, const struct iovec __user * uvector,
                 unsigned nr_segs, unsigned fast_segs,
                 struct iovec **iov, struct iov_iter *i)
{
    5344:       d503233f        paciasp
    5348:       d10143ff        sub     sp, sp, #0x50
    534c:       a9017bfd        stp     x29, x30, [sp, #16]
    5350:       f90013f7        str     x23, [sp, #32]
    5354:       a90357f6        stp     x22, x21, [sp, #48]
    5358:       a9044ff4        stp     x20, x19, [sp, #64]
    535c:       910043fd        add     x29, sp, #0x10
    5360:       90000008        adrp    x8, 0 <__stack_chk_guard>
    5364:       f9400108        ldr     x8, [x8]
    5368:       aa0403f3        mov     x19, x4
        ssize_t n;
        struct iovec *p;
        n = rw_copy_check_uvector(type, uvector, nr_segs, fast_segs,
    536c:       2a0203f7        mov     w23, w2
    5370:       aa0503f5        mov     x21, x5
    5374:       f90007e8        str     x8, [sp, #8]
                                  *iov, &p);
    5378:       f9400084        ldr     x4, [x4]
        n = rw_copy_check_uvector(type, uvector, nr_segs, fast_segs,
    537c:       2a0303e3        mov     w3, w3
    5380:       910003e5        mov     x5, sp
    5384:       aa1703e2        mov     x2, x23
    5388:       2a0003f6        mov     w22, w0
    538c:       94000000        bl      5170 <rw_copy_check_uvector>
    5390:       f94003e8        ldr     x8, [sp]
    5394:       aa0003f4        mov     x20, x0
        if (n < 0) {
    5398:       b7f80220        tbnz    x0, #63, 53dc <import_iovec+0x98>
        WARN_ON(direction & ~(READ | WRITE));
    539c:       71000adf        cmp     w22, #0x2
    53a0:       54000462        b.cs    542c <import_iovec+0xe8>  // b.hs, b.nlast
    53a4:       d5384109        mrs     x9, sp_el0
        if (uaccess_kernel()) {
    53a8:       f9400529        ldr     x9, [x9, #8]
    53ac:       5280008a        mov     w10, #0x4                       // #4
    53b0:       5280010b        mov     w11, #0x8                       // #8
                i->kvec = (struct kvec *)iov;
    53b4:       a901dea8        stp     x8, x23, [x21, #24]
        if (uaccess_kernel()) {
    53b8:       b100053f        cmn     x9, #0x1
    53bc:       1a8a0169        csel    w9, w11, w10, eq  // eq = none
    53c0:       330002c9        bfxil   w9, w22, #0, #1
                i->type = ITER_KVEC | direction;
    53c4:       b90002a9        str     w9, [x21]
        i->iov_offset = 0;
    53c8:       a900d2bf        stp     xzr, x20, [x21, #8]
                        kfree(p);
                *iov = NULL;
                return n;
        }
        iov_iter_init(i, type, p, nr_segs, n);
        *iov = p == *iov ? NULL : p;
    53cc:       f9400269        ldr     x9, [x19]
    53d0:       eb09011f        cmp     x8, x9
    53d4:       9a8803e8        csel    x8, xzr, x8, eq  // eq = none
    53d8:       14000007        b       53f4 <import_iovec+0xb0>
                if (p != *iov)
    53dc:       f9400269        ldr     x9, [x19]
    53e0:       eb09011f        cmp     x8, x9
    53e4:       54000060        b.eq    53f0 <import_iovec+0xac>  // b.none
                        kfree(p);
    53e8:       aa0803e0        mov     x0, x8
    53ec:       94000000        bl      0 <kfree>
    53f0:       aa1f03e8        mov     x8, xzr
    53f4:       f9000268        str     x8, [x19]
    53f8:       90000009        adrp    x9, 0 <__stack_chk_guard>
    53fc:       f94007e8        ldr     x8, [sp, #8]
    5400:       f9400129        ldr     x9, [x9]
    5404:       eb08013f        cmp     x9, x8
    5408:       54000161        b.ne    5434 <import_iovec+0xf0>  // b.any
        return n;
}
    540c:       aa1403e0        mov     x0, x20
    5410:       a9444ff4        ldp     x20, x19, [sp, #64]
    5414:       a94357f6        ldp     x22, x21, [sp, #48]
    5418:       f94013f7        ldr     x23, [sp, #32]
    541c:       a9417bfd        ldp     x29, x30, [sp, #16]
    5420:       910143ff        add     sp, sp, #0x50
    5424:       d50323bf        autiasp
    5428:       d65f03c0        ret
        WARN_ON(direction & ~(READ | WRITE));
    542c:       d4210000        brk     #0x800
    5430:       17ffffdd        b       53a4 <import_iovec+0x60>
    5434:       94000000        bl      0 <__stack_chk_fail>