evie/android_kernel_oneplus_msm8998
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Merge "Prevent potential double frees in sg driver"

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Linux Build Service Account 2017-11-21 06:44:56 -08:00 • committed by Gerrit - the friendly Code Review server
commit c4f4e49994
1 changed files with 18 additions and 10 deletions
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14
drivers/scsi/sg.c
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@ -898,8 +898,10 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
return -ENXIO; return -ENXIO;
if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
return -EFAULT; return -EFAULT;
mutex_lock(&sfp->parentdp->open_rel_lock);
result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
1, read_only, 1, &srp); 1, read_only, 1, &srp);
mutex_unlock(&sfp->parentdp->open_rel_lock);
if (result < 0) if (result < 0)
return result; return result;
result = wait_event_interruptible(sfp->read_wait, result = wait_event_interruptible(sfp->read_wait,
@ -939,8 +941,10 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
sfp->low_dma = 1; sfp->low_dma = 1;
if ((0 == sfp->low_dma) && !sfp->res_in_use) { if ((0 == sfp->low_dma) && !sfp->res_in_use) {
val = (int) sfp->reserve.bufflen; val = (int) sfp->reserve.bufflen;
mutex_lock(&sfp->parentdp->open_rel_lock);
sg_remove_scat(sfp, &sfp->reserve); sg_remove_scat(sfp, &sfp->reserve);
sg_build_reserve(sfp, val); sg_build_reserve(sfp, val);
mutex_unlock(&sfp->parentdp->open_rel_lock);
} }
} else { } else {
if (atomic_read(&sdp->detaching)) if (atomic_read(&sdp->detaching))
@ -1009,8 +1013,8 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
result = get_user(val, ip); result = get_user(val, ip);
if (result) if (result)
return result; return result;
if (val < 0) if (val < 0)
return -EINVAL; return -EINVAL;
val = min_t(int, val, val = min_t(int, val,
max_sectors_bytes(sdp->device->request_queue)); max_sectors_bytes(sdp->device->request_queue));
mutex_lock(&sfp->f_mutex); mutex_lock(&sfp->f_mutex);
@ -1020,9 +1024,10 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
mutex_unlock(&sfp->f_mutex); mutex_unlock(&sfp->f_mutex);
return -EBUSY; return -EBUSY;
} }
mutex_lock(&sfp->parentdp->open_rel_lock);
sg_remove_scat(sfp, &sfp->reserve); sg_remove_scat(sfp, &sfp->reserve);
sg_build_reserve(sfp, val); sg_build_reserve(sfp, val);
mutex_unlock(&sfp->parentdp->open_rel_lock);
} }
mutex_unlock(&sfp->f_mutex); mutex_unlock(&sfp->f_mutex);
return 0; return 0;
@ -2640,6 +2645,9 @@ static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
seq_puts(s, srp->done ? seq_puts(s, srp->done ?
((1 == srp->done) ? "rcv:" : "fin:") ((1 == srp->done) ? "rcv:" : "fin:")
: "act:"); : "act:");
seq_printf(s, srp->done ?
((1 == srp->done) ? "rcv:" : "fin:")
: "act:");
seq_printf(s, " id=%d blen=%d", seq_printf(s, " id=%d blen=%d",
srp->header.pack_id, blen); srp->header.pack_id, blen);
if (srp->done) if (srp->done)