diff options
| author | Michel Dänzer <michel@tungstengraphics.com> | 2007-05-26 04:37:08 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@linux.ie> | 2007-05-26 04:37:08 +1000 |
| commit | c4814f9001a8dd28e39311a919beac34f778f76d (patch) | |
| tree | 0ff5e1129973d7522964fef2659e11e29f31a270 /drivers/char/drm | |
| parent | 777c7738a598c6e8d4b850181a509757fb79cf36 (diff) | |
drm: make sure the drawable code doesn't call malloc(0).
Signed-off-by: Michel Dänzer <michel@tungstengraphics.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers/char/drm')
| -rw-r--r-- | drivers/char/drm/drm_drawable.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/drivers/char/drm/drm_drawable.c b/drivers/char/drm/drm_drawable.c index de37d5f7456..b33313be254 100644 --- a/drivers/char/drm/drm_drawable.c +++ b/drivers/char/drm/drm_drawable.c @@ -172,38 +172,49 @@ int drm_rmdraw(DRM_IOCTL_ARGS) bitfield_length = idx + 1; - if (idx != id / (8 * sizeof(*bitfield))) - bitfield = drm_alloc(bitfield_length * - sizeof(*bitfield), DRM_MEM_BUFS); + bitfield = NULL; - if (!bitfield && bitfield_length) { - bitfield = dev->drw_bitfield; - bitfield_length = dev->drw_bitfield_length; + if (bitfield_length) { + if (bitfield_length != dev->drw_bitfield_length) + bitfield = drm_alloc(bitfield_length * + sizeof(*bitfield), + DRM_MEM_BUFS); + + if (!bitfield) { + bitfield = dev->drw_bitfield; + bitfield_length = dev->drw_bitfield_length; + } } } if (bitfield != dev->drw_bitfield) { info_length = 8 * sizeof(*bitfield) * bitfield_length; - info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS); + if (info_length) { + info = drm_alloc(info_length * sizeof(*info), + DRM_MEM_BUFS); - if (!info && info_length) { - info = dev->drw_info; - info_length = dev->drw_info_length; - } + if (!info) { + info = dev->drw_info; + info_length = dev->drw_info_length; + } + } else + info = NULL; spin_lock_irqsave(&dev->drw_lock, irqflags); - memcpy(bitfield, dev->drw_bitfield, bitfield_length * - sizeof(*bitfield)); + if (bitfield) + memcpy(bitfield, dev->drw_bitfield, bitfield_length * + sizeof(*bitfield)); drm_free(dev->drw_bitfield, sizeof(*bitfield) * dev->drw_bitfield_length, DRM_MEM_BUFS); dev->drw_bitfield = bitfield; dev->drw_bitfield_length = bitfield_length; if (info != dev->drw_info) { - memcpy(info, dev->drw_info, info_length * - sizeof(*info)); + if (info) + memcpy(info, dev->drw_info, info_length * + sizeof(*info)); drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length, DRM_MEM_BUFS); dev->drw_info = info; |